Software

Web Development

HTML, CSS, and JavaScript — references and tutorials for the front end.

Tutorials

HTML Dog (Website) — tutorials, techniques, and worked examples for HTML, CSS, and JavaScript, plus full references for tags, attributes, character entities, CSS properties, selectors, values, and media queries. Run out of Edinburgh since 2003, with no framework detours.
W3Schools — CSS Tutorial (Website) — the CSS course most people meet first, running from selectors and the box model through flexbox, grid, transitions, animations, and custom properties. Over 700 examples, each opening in an in-page editor where you change the CSS and press run, with chapter exercises, quizzes, and full references for properties, selectors, at-rules, functions, and units alongside.