javascript.info
The Modern JavaScript Tutorial
From variables to async, with tasks after each chapter. Still the site people send juniors to.
JavaScript
Programming primers
83 tutorial sites. Filter later by language. Submissions go to review.
WEB
Web24 primers
BACK
Backend18 primers
DATA
Data12 primers
MOB
Mobile9 primers
TOOL
Tools11 primers
ALG
Algorithms9 primers
Just listed
web.dev
web.dev
Performance, accessibility, and the baseline you can actually ship. Not a from-zero course.
HTMLCSSJavaScript
phptherightway
PHP The Right Way
A living pamphlet: versions, PDO, packages. Read it before a random Stack Overflow answer.
PHP
css-tricks