1. Codecademy – One of the best free website to learn web programming.
  2. Coursera – Take free courses from professors all over the world. Courses are mostly about technology and programming.
  3. Scratch – A very fun project from MIT. The target audience is children, but for beginner programmers it is perfect to learn the logic of programming.
  4. SQL Zoo – Perfect site to learn the basics of the SQL (Structured Query Language). Most of the databases uses this language or very similar to it. Also the site offers an interactive surface to try out what you learnt.
  5. Udacity – Offers courses mostly about computer science. The most populars are about web programming, but you can find courses about artificial intelligence too.