Added essential sections to mkr shields

content/hardware/01.mkr/02.shields/mkr-485-shield/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-485-shield/mkr-485-communication">
+    All you need to know to get started with your new Arduino Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+
+  <EssentialElement title="ArduinoRS485" type="library" link="https://www.arduino.cc/reference/en/libraries/arduinors485/">
+    The ArduinoRS485 library enables sending and receiving data using the RS-485 standard with RS-485 shields, like the MKR 485 Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/02.shields/mkr-can-shield/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-can-shield/mkr-can-communication">
+    All you need to know to get started with your new Arduino Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+
+  <EssentialElement title="Arduino-CAN" type="library" link="https://github.com/sandeepmistry/arduino-CAN">
+    The Arduino-CAN library enables sending and receiving data using a CAN bus.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/02.shields/mkr-env-shield/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-env-shield/mkr-env-shield-basic">
+    All you need to know to get started with your new Arduino Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+
+  <EssentialElement title="Arduino-MKRENV" type="library" link="https://www.arduino.cc/reference/en/libraries/arduino_mkrenv/">
+    The ArduinoMKRENV library lets you access the different sensors, such as temperature, humidity & pressure that you can find on the MKR ENV Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/02.shields/mkr-eth-shield/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-eth-shield/mkr-eth-shield-webserver">
+    All you need to know to get started with your new Arduino Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+
+  <EssentialElement title="Ethernet library" type="library" link="https://www.arduino.cc/en/Reference/Ethernet">
+    The Ethernet library works with the MKR ETH Shield to connect your board to the internet. 
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/02.shields/mkr-gps-shield/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-gps-shield/mkr-gps-basic">
+    All you need to know to get started with your new Arduino Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+
+  <EssentialElement title="Arduino_MKRGPS library" type="library" link="https://www.arduino.cc/reference/en/libraries/arduino_mkrgps/">
+    The Arduino_MKRGPS library allows you to read the location from the GPS on your MKR GPS Shield. 
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/02.shields/mkr-imu-shield/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-imu-shield/mkr-imu-shield-basics">
+    All you need to know to get started with your new Arduino Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+
+  <EssentialElement title="MKRIMU library" type="library" link="https://www.arduino.cc/reference/en/libraries/mkrimu/">
+    The MKRIMU library allows you to read the acceleration, gyroscope, magnetic field and euler angles from the IMU on your MKR IMU shield. 
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/02.shields/mkr-mem-shield/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-mem-shield/mkr-mem-shield-data-logger">
+    All you need to know to get started with your new Arduino Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+
+  <EssentialElement title="Arduino-MKRMEM" type="library" link="https://www.arduino.cc/reference/en/libraries/arduino_mkrmem/">
+    The ArduinoMKRMEM library lets you access the flash memory on the MKRMEM Shield.
+  </EssentialElement>
+
+  <EssentialElement title="SD library" type="library" link="https://www.arduino.cc/en/Reference/SD">
+    The SD library allows you to read and write to SD cards. 
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/02.shields/mkr-relay-proto-shield/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-relay-proto-shield/mkr-relay-shield-basic">
+    All you need to know to get started with your new Arduino Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+<EssentialElement>
+The MKR Relay Shield requires no external libraries.
+</EssentialElement>
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/02.shields/mkr-rgb-shield/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-rgb-shield/mkr-rgb-fade">
+    All you need to know to get started with your new Arduino Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+  <EssentialElement title="Arduino_MKRRGB library" type="library" link="https://www.arduino.cc/reference/en/libraries/arduino_mkrrgb/">
+    The MKRRGB library lets you draw on your MKR RGB Shield. 
+  </EssentialElement>
+
+  <EssentialElement title= "ArduinoGraphics library" type="library" link="https://www.arduino.cc/reference/en/libraries/arduinographics/">
+    The ArduionoGraphics is a core graphics library for Arduino that is based on the processing API. 
+  </EssentialElement>
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/02.shields/mkr-sd-proto-shield/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-sd-proto-shield/mkr-sd-proto-shield-data-logger">
+    All you need to know to get started with your new Arduino Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+  <EssentialElement title="SD library" type="library" link="https://www.arduino.cc/en/Reference/SD">
+    The SD library allows you to read and write to SD cards. 
+  </EssentialElement>
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/02.shields/mkr-therm-shield/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-therm-shield/mkr-therm-shield-basic">
+    All you need to know to get started with your new Arduino Shield.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+  <EssentialElement title="Arduino MKR THERM library" type="library" link="https://www.arduino.cc/en/Reference/ArduinoMKRTHERM">
+    The Arduino MKR THERM library allows you to manage the thermocouple that is attached to the MKR THERM shield.
+  </EssentialElement>
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/03.carriers/mkr-connector-carrier/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-connector-carrier/connector-basics">
+    All you need to know to get started with your new Arduino Carrier.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/03.carriers/mkr-iot-carrier/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="https://opla.arduino.cc/">
+    All you need to know to get started with your new Arduino Carrier.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+
+  <EssentialElement title="Arduino_MKRIoTCarrier" type="library" link="https://www.arduino.cc/reference/en/libraries/arduino_mkriotcarrier/">
+    The Arduino_MKRIoTCarrier library allows you to control the IoT MKR Carrier and all the components included in the Explore IoT Kit.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>

content/hardware/01.mkr/03.carriers/mkr-motor-carrier/essentials.md

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+<EssentialsColumn title="First Steps">
+  <EssentialElement title="Quickstart Guide" type="getting-started" link="/tutorials/mkr-motor-carrier/mkr-motor-carrier-battery">
+    All you need to know to get started with your new Arduino Carrier.
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Suggested Libraries">
+
+  <EssentialElement title="Arduino_MotorCarrier" type="library" link="https://www.arduino.cc/reference/en/libraries/arduinomotorcarrier/">
+    The Arduino_MotorCarrier library allows you to use the Nano and MKR Arduino Motor Carriers. 
+  </EssentialElement>
+
+</EssentialsColumn>
+
+<EssentialsColumn title="Arduino Basics">
+  <EssentialElement title="Built-in Examples" type="tutorial" link="/built-in-examples/">
+    Built-in Examples are sketches included in the Arduino IDE and demonstrate all basic Arduino commands. 
+  </EssentialElement>
+  <EssentialElement title="Learn" type="resource" link="/learn/">
+    Discover interesting articles, principles and techniques related to the Arduino ecosystem.
+  </EssentialElement>
+  <EssentialElement title="Language References" type="resource" link="https://www.arduino.cc/reference/en/">
+  Arduino programming language can be divided in three main parts: functions, values (variables and constants), and structure.
+  </EssentialElement>
+</EssentialsColumn>