HTML

Learn basic HTML and CSS
HTML Element Reference MDN
CodePen Intro to CSS
How to write HTML how-to-write-html
https://www.makeuseof.com/tag/html-faq/
Tables tables
HTML Emails html-emails
Form data form-data
GET vs POST get-vs-post
Nunjucks nunjucks

Cache cache

ASCII Codes HTML entities
https://www.ascii-code.com/