Sites that offer tutorials on many languages at many levels
- Codecademy offers a wide range of classes, including languages (HTML, R, SQL, Python and many more) and subjects such as web development, game development and others.
- W3 Schools provides tutorials on HTML, CSS, Javascript, XML, JSON and many more
- SoloLearn also overs a wide variety of classes including Python, C++, Java and many more
- Coursera says that they partner "with more than 200 leading universities and companies to bring flexible, affordable, job-relevant online learning to individuals and organizations worldwide. We offer a range of learning opportunities—from hands-on projects and courses to job-ready certificates and degree programs."
- SanJose State University's coding guide is a nice collection of links and general information
- Davenport University's coding guide has links to sites that help you learn to code and other tools
