Learn how to create website using Flask from https://www.youtube.com/watch?v=MwZwr5Tvyxo&list=PL-osiE80TeTs4UjLw5MM6OjgkjFeUxCYH
In init.py, we need to set the EMAIL_USER and EMAIL_PASS in environment variable locally.
For Windows:
https://www.youtube.com/watch?v=IolxqkL7cD8
For Mac/Linux:
https://www.youtube.com/watch?v=5iWhQWVXosU