SICP

Say, someone who has no prior experience with programming, and is at a rather 'young' age (Teen still) wants to get ahead of the game, and start up now, rather than later. Would one go about this by reading SICP? I've seen it linked so many times, I've only got to think it's a start.

TCO itself is deeply flawed in this respect. It is not at all obvious when a call is in the tail position, if you consider more dense coding styles. Can you explain why foldr (+) 0 [1..1000000] stackoverflows? I mean, it doesn't stackoverflow in the foldr itself, stack overflow happens when the expression it constructs is forced, but why is the evaluation not TCO'd?
Foldr isn't tail recursive