All muhaza's note in developing website. Front-end & uiux method. Real life implementation for webdesigner.
https://vegibit.com/the-top-100-most-commonly-used-wordpress-functions/
https://colorwhistle.com/wordpress-functions-list/
https://www.wpbeginner.com/wp-tutorials/25-extremely-useful-tricks-for-the-wordpress-functions-file/