freeCodeCamp
freecodecamp.orgLearn 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.comWhere the world's code lives: over 100 million developers hosting, reviewing and shipping software together.
Java
java.comGet the latest Java Software and explore how Java technology provides a better digital experience.
JavaScript - MDC
developer.mozilla.org/en/JavaScriptNetscape's JavaScript is a superset of the ECMA-262 Edition 3 (ECMAScript) standard scripting language, with only mild differences from the published standard.
MDN Web Docs
developer.mozilla.orgMozilla's documentation for HTML, CSS and JavaScript. The reference professional web developers keep open all day.
Microsoft ASP.NET
asp.netMicrosoft portal site for the ASP.NET development community. Download Visual Web Developer, post to the forums, read ASP.net blogs and learn about ASP.net
PHP: Hypertext Preprocessor
php.netPHP is an HTML-embedded scripting language. Much of its syntax is borrowed from C, Java and Perl with a couple of unique PHP-specific features thrown in. The goal of the language is to allow web developers to write dynamically generated pages quickly.
Python.org
python.orgThe official home of the Python Programming Language.
Stack Overflow
stackoverflow.comThe 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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