Resources

Free courses. Each course includes projects.

A free course for people with no programming experience.

A free course. You build projects to learn full web development.

A reference for HTML, CSS, and JavaScript. Professional programmers use this site to check syntax.

References for most web languages. Each page includes examples.

Documentation for many languages and frameworks. You can search all of them in one place.

A free introduction to computer science from Harvard. This course covers more material than most introduction courses.

Short exercises in many languages. People review your solutions and give feedback.

A set of algorithm puzzles. One new puzzle appears each day in December.

A question and answer site for programming problems. Search for your error message before you post a new question.

A site that stores code for most open-source projects. You can read the code of real projects here.