freeCodeCamp
freecodecamp.org
Learn to code for free with a nonprofit curriculum that has helped thousands land developer jobs. Certifications included, no catch.
Programming: The Best Websites
GitHub
github.com
Where the world's code lives: over 100 million developers hosting, reviewing and shipping software together.
Java
java.com
Java still runs billions of devices: get the free Java runtime here, check whether you have it installed, and find help for the language behind countless business applications and Minecraft.
JavaScript (MDN Web Docs)
developer.mozilla.org/en-US/docs/Web/JavaScript
MDN's JavaScript documentation is the language's de facto reference: every method and operator explained with live examples, from first steps to the specification's dark corners.
MDN Web Docs
developer.mozilla.org
Mozilla's documentation for HTML, CSS and JavaScript. The reference professional web developers keep open all day.
Microsoft ASP.NET
asp.net
Microsoft's official ASP.NET site: build web apps with C# and .NET, with free tutorials, downloads and documentation for Blazor and ASP.NET Core.
PHP: Hypertext Preprocessor
php.net
The official home of PHP, the language running most of the web including WordPress: downloads, the canonical documentation and release announcements.
Python.org
python.org
The official home of the Python Programming Language.
Stack Overflow
stackoverflow.com
The Q&A site where programming problems go to get solved. The error message you just got has almost certainly been answered here.
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