What are rules to follow in WordPress plugin development?

Find a unique name

Setup a prefix (related to your brand)

Create the plugin’s folder

Create sub-folders for PHP files, assets, and translations

Create the main plugin file and fill in obligatory header information

Create a readme.txt file

Use proper constants and functions to detect paths to plugin files

Create additional PHP files and include them inside the main one

Create activation and deactivation functions

Create an uninstall script