HTML - Gargioni/Project-SdG GitHub Wiki

Documentação

https://developer.mozilla.org/pt-BR/docs/Web/HTML/HTML5/HTML5_element_list

https://developer.mozilla.org/en-US/docs/Web/HTML/Element

Escolas Online

http://www.w3schools.com/html/html5_intro.asp

https://www.udemy.com/learn-html5-programming-from-scratch/

https://msdn.microsoft.com/en-us/hh549253.aspx

https://www.codecademy.com/pt-BR/learn/web

Comunidades

https://www.reddit.com/r/html5