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I feel like I should note that I've watched the Star Wars movies as a kid, but it has been a while, and I may have missed/forgotten a lot of details along the way. Also, the movies are all I've seen. I've never read any of the books or anything like that.
I was wondering why Obi-Wan Kenobi and Yoda didn't train Luke from the time he was very young. Obi-Wan knew where Yoda was, so the two of them could have trained Luke from a very young age. They could have helped him become very strong by the time the first movie began. Why didn't they do that? Why was giving Luke to his aunt and uncle more preferable?