What are the basic rules to follow while developing WordPress plugin?

Here is a list of crucial rules that require to be followed by the developers while developing a WordPress plugin:

• Unique user name creation
• Plugin folder creation
• Creation of sub-folder for PHP files, assets, and translations.
• Activation and deactivation function creation
• The main plugin file creation and fill the header information
• Script for uninstall creation.
• readme.txt file creation
• Use of proper functions and constants to detect paths of the plugin file.