the list of all tags in html?

Answer 1

https://www.geeksforgeeks.org/most-commonly-used-tags-in-html/

https://way2tutorial.com/html/tag/index.php

All commun used tags in HTML

Answer 2

See the W3C pages for complete lists in all versions and full documentation.

Answer 3

Reliable source from Mozilla
https://developer.mozilla.org/en-US/docs/Web/HTML/Element