I see a lot of posts about slow playing big hands, asking about AA or KK. I don't think these are big hands, still just 1 pair.
Commonly the best hand is 2 pair or better. Flop 2 pair, a set, flush, straight, ect... are a big hand that at your option could be slow played. I'm not sure how you slow play 1 pair.
Yes AA and KK are the best starting hands, but often its very hard to get them to improve. The best strategy is to always play them aggressively or you are going to see them "cracked" at a higher percentage than normal.