Knowing when to fold em

O.K. Let say Player A gets dealt Ah, Kh and you raise 3X the big blind and only one player (Player B) calls. The flop is As, 9s, 7s. Player A raises the same amount and Player B calls. The turn is a 6s. Player A raise more and the Player B calls. The river is a 9d. Player A raises the same amount and Player b calls. What Player B has is irrelevant for this discussion. Do you think Player A should have folded at any point, should have been more aggressive, or played it right? Also, when you're being aggressive and other players keep calling you, when do you know (or should know) when to fold?

After the 4th spade hit the board assume your aces are sunk. It only takes the deuce to beat you. In that case you have to analyze the other player's play up to that point. Make an educated guess and hope for the best.

hmmmm relatively small bets on the turn and river? IF you were going to bet when that 4th spade hit you should have BET. I might make a similar mistake here but it likely would have been much more expensive. You were basically begging for calls. You had the right idea but if you were going to bet the turn you should have hit it a tad bit harder or checked.

Bet more than less than 1/2 the pot on the flop... 3/4 to a pot sized bet is good here.

He calls, what is his range of hands? A medium spade? A pair with a flush draw? A hand like 10-9, J9, Q9 with the unpaired card a spade?

The turn is another spade, so you can either slow down and check and give up on the hand or bet out strong representing a flush. Personally I would check and pray it gets checked down to showdown, but you are beat more often than not here.

Your weak flop bet gives good odds for a hand like a 10-9 or J-9 with a spade to catch up...

I don't bet the river if you bet the turn and get called. You opponent most likely has a weak flush that isn't worth a raise from him...

More often than not you are just dumping more chips on the river...check it down.

you have to know when