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How to study computer science
Check out free online courses.
If you cannot or don't want to attend an undergraduate program in computer science, you'll be pleasantly surprised at the availability of free coursework online.
For example, you can sign up for computer science related courses on coursera.
You should also check out opencourseware from the massachusetts institute of technology. It is a goldmine of information for people who want to have access to computer science materials at an academic level without paying tuition.