1 and 2 were answered by others. In my opinion, 3 and 4 make you better understand the reality which makes you a better programmer. Chances are that you will no

1 and 2 were answered by others. In my opinion, 3 and 4 make you better understand the reality which makes you a better programmer. Chances are that you will not use this knowledge. On the other hand it could give you some useful ideas.