Thank you, Michael Anello, for a great cheatsheet of cheetsheets!
- https://www.drupaleasy.com/blogs/ultimike/2022/08/are-cheatsheets-still-thing-drupal-developers
- Flexbox https://css-tricks.com/snippets/css/a-guide-to-flexbox/
- Drupal 8 API https://www.metaltoad.com/blog/drupal-8-entity-api-cheat-sheet
- Form Element https://drupalize.me/tutorial/form-element-reference?p=2766
- https://cheatography.com/programming/