I don't browse 4chan so much nowadays...when anons say "don't forget you are here forever", it's false, you can leave 4chan for many days. /pol/ is garbage but can be good if you use the word filters, /lit/, /fit/ are good to learn but once you have learnt you should learn by yourself and research. when i use 4chan it's /sp/ the sports board for me when there are matches or big transfers.

2 - Use 4plebs.org/pol/ for finding old stuff, it's way better than to actually use 4chan, you find opinions about books, or movies or whatever. great website to find answers instead of actually engaging in discussion with anons.