When are you willing to NOT stack off with AA? I play 2NL...but will probably move up to 5NL in a few months. I'm having trouble folding AA post flop...especially after a pot sized bet on the flop.

Against most of the donks on non coordinated boards. Against the better regs AA is a easy fold to a raise, they are set mining mostly and not getting it all in with less than 2pr ever.

Do you mean a pot size bet of your own? If so, you should get out of that mentality; the money in the pot belongs to the pot, you should never continue a hand when you think/know you've lost just because you've put a lot into it already.

You should probably not be willing to fold AA very easily against the 2nl fish. When they stack off they've usually got something, but whether or not it's something that beats you can be difficult/impossible to determine. If they're short-stacked, they'll stack off with like TPBK. If they aren't short-stacked, you should probably think twice if it's a drawy board. Against the players you judge to be more competent, obviously a shove from them carries a lot more weight and you should be much more willing to fold.

after i bet the flop...I raised UTG 4xBB with AA...get a single caller....and the flop is J-8-7 or K-T-7...two tone flops...and I get raised...do u fold or move in?

It is depending on so many things, vs what player, how many players are in the pot and on what board how deep we are and so on. vs really bad players stack off everytime, vs passive players who suddenly get agressive in a multi pot i might fold and vs tight reggs who almost only get it in w 2pair and better i can fold a lot of the times but still depending on board and reads.

id get it in on those flops vs most opponents at 2nl.
could be tptk, flushdraw or even one over with a gutter or **** like that.
2pair is highly unlikely on those boards and a set is hard to make.

On a J87 two tone flop, villain is likely on a draw. Aces are often a favorite. No need to dig too deep into nl2 players heads, just go for it.

Do you have ANY idea of how incomplete this question is and how impossible for anyone to give a reasonable answer with just that???