diff --git a/build/controllers/DevController.php b/build/controllers/DevController.php
index e31c9a59d9d..fdd8022cc58 100644
--- a/build/controllers/DevController.php
+++ b/build/controllers/DevController.php
@@ -16,8 +16,8 @@
 /**
  * This command helps to set up a dev environment with all extensions and applications.
  *
- * It will clone an extension or app repo and link the yii2 dev installation to the containted applications/extensions vendor dirs
- * to help working on yii using the application to test it.
+ * It will clone an extension or app repo and link the yii2 dev installation to the contained applications/extensions vendor dirs
+ * to help to work on yii using the application to test it.
  *
  * @author Carsten Brandt <mail@cebe.cc>
  * @since 2.0
@@ -29,7 +29,7 @@ class DevController extends Controller
      */
     public $defaultAction = 'all';
     /**
-     * @var bool whether to use HTTP when cloning github repositories
+     * @var bool whether to use HTTP when cloning GitHub repositories
      */
     public $useHttp = false;
     /**
diff --git a/build/controllers/PhpDocController.php b/build/controllers/PhpDocController.php
index 144413f8228..e0bcecce684 100644
--- a/build/controllers/PhpDocController.php
+++ b/build/controllers/PhpDocController.php
@@ -14,7 +14,7 @@
 use yii\helpers\Json;
 
 /**
- * PhpDocController is there to help maintaining PHPDoc annotation in class files.
+ * PhpDocController is there to help to maintain PHPDoc annotation in class files.
  *
  * @author Carsten Brandt <mail@cebe.cc>
  * @author Alexander Makarov <sam@rmcreative.ru>
@@ -871,11 +871,11 @@ protected function hasSetterInParents($className, $propName)
      */
     protected function isBaseObject($className, \ReflectionClass $ref)
     {
-        $isDepreceatedObject = false;
+        $isDeprecatedObject = false;
         if (PHP_VERSION_ID <= 70100) {
-            $isDepreceatedObject = $ref->isSubclassOf('yii\base\Object') || $className === 'yii\base\Object';
+            $isDeprecatedObject = $ref->isSubclassOf('yii\base\Object') || $className === 'yii\base\Object';
         }
-        return !$isDepreceatedObject && !$ref->isSubclassOf('yii\base\BaseObject') && $className !== 'yii\base\BaseObject';
+        return !$isDeprecatedObject && !$ref->isSubclassOf('yii\base\BaseObject') && $className !== 'yii\base\BaseObject';
     }
 
     private function shouldSkipClass($className)
diff --git a/build/controllers/ReleaseController.php b/build/controllers/ReleaseController.php
index 2bd825eee69..1d73fa5f6d8 100644
--- a/build/controllers/ReleaseController.php
+++ b/build/controllers/ReleaseController.php
@@ -15,7 +15,7 @@
 use yii\helpers\FileHelper;
 
 /**
- * ReleaseController is there to help preparing releases.
+ * ReleaseController is there to help to prepare releases.
  *
  * Get a version overview:
  *
@@ -53,7 +53,7 @@ class ReleaseController extends Controller
      */
     public $dryRun = false;
     /**
-     * @var bool whether to fetch latest tags.
+     * @var bool whether to fetch the latest tags.
      */
     public $update = false;
     /**
@@ -206,7 +206,7 @@ public function actionRelease(array $what)
                 $newVersions[$k] = $this->version;
             }
         } else {
-            // otherwise get next patch or minor
+            // otherwise, get next patch or minor
             $newVersions = $this->getNextVersions($versions, self::PATCH);
         }
 
@@ -803,7 +803,7 @@ protected function gitFetchTags($path)
         try {
             chdir($path);
         } catch (\yii\base\ErrorException $e) {
-            throw new Exception('Failed to getch git tags in ' . $path . ': ' . $e->getMessage());
+            throw new Exception('Failed to fetch git tags in ' . $path . ': ' . $e->getMessage());
         }
         exec('git fetch --tags', $output, $ret);
         if ($ret != 0) {
diff --git a/build/controllers/TranslationController.php b/build/controllers/TranslationController.php
index b4d2164d262..dd89ad24ea9 100644
--- a/build/controllers/TranslationController.php
+++ b/build/controllers/TranslationController.php
@@ -29,7 +29,6 @@ class TranslationController extends Controller
      * @param string $sourcePath the directory where the original documentation files are
      * @param string $translationPath the directory where the translated documentation files are
      * @param string $title custom title to use for report
-     * @return string
      */
     public function actionReport($sourcePath, $translationPath, $title = 'Translation report')
     {
diff --git a/build/controllers/Utf8Controller.php b/build/controllers/Utf8Controller.php
index ca5175dbfd6..673d9bfdeeb 100644
--- a/build/controllers/Utf8Controller.php
+++ b/build/controllers/Utf8Controller.php
@@ -69,11 +69,11 @@ public function actionCheckGuide($directory = null)
                 }
                 if ($ord < 0x0020 && $ord != 0x000A && $ord != 0x0009 ||
                     0x0080 <= $ord && $ord < 0x009F) {
-                    $this->found('CONTROL CHARARCTER', $c, $line, $pos, $file);
+                    $this->found('CONTROL CHARACTER', $c, $line, $pos, $file);
                     continue;
                 }
 //                if ($ord > 0x009F) {
-//                    $this->found("NON ASCII CHARARCTER", $c, $line, $pos, $file);
+//                    $this->found("NON ASCII CHARACTER", $c, $line, $pos, $file);
 //                    continue;
 //                }
             }
diff --git a/cs/src/YiiConfig.php b/cs/src/YiiConfig.php
index 4e2e28ff703..95442861a4e 100644
--- a/cs/src/YiiConfig.php
+++ b/cs/src/YiiConfig.php
@@ -156,7 +156,7 @@ public function __construct($name = 'yii-cs-config')
     }
 
     /**
-     * Merge current rules config with provided list of rules.
+     * Merge current rules' config with provided list of rules.
      *
      * @param array $rules
      * @return $this