KAWWA Markup pattern library
More than 60 HTML patterns crafted to help you create the basis for your standard, accessible and responsive web sites.
“HTML”
SEO H1 to H6
How To Use HTML Headings Elements Properly in 2018
HTML5 Elements
Google HTML/CSS Style Guide
Styling tables
– Learn web development | MDN
Structural Semantics
The Importance Of HTML5 Sectioning Elements – Smashing Magazine
Interneting is hard but doesn't have to be
Friendly web development tutorials for complete beginners