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comment Why do people use programming books?
Having a book as a reference is very useful--you gain from the experience of others. The "book" could even be extensive online documentation/tutorials like django or jquery. But trial & error + reading source alone will leave major gaps in your knowledge. Now if you only need a few lines of jQuery, your method works but you didn't learn the language. But if you want to learn C, I'd recommend having K&R as a reference. Sure most info is online somewhere, but scattered throughout many blog posts.