Youtube-каналы
Mozilla Developer
HTML Academy
Dcode
Kevin Powell
Справочники
W3Schools (HTML, CSS, JS)
Webreference
Caniuse
Learnxinyminutes (HTML, CSS, JS, SASS)
Уроки
HTML
HTML Crash Course For Absolute Beginners
W3Schools – HTML Tutorial
HTML Full Course - Build a Website Tutorial
A few...