in party bedut I 4bet when I am the first speaker with AA and raise to 5 bet or 9 bet according to the profile of the player who has already bet before me. on the other hand in the middle and at the end of the game. I prefer all-in preflop especially if I have already done it with other hands. because my opponents tend to call when they don't believe you.
Depends on position, where you are I tournament, stack sizes, etc. Main thing is you want to to raise enough so you will only be heads up. The more players the more likely they will crack your aces. AA is only good preflop. Most like you will still only have one pair after flop.
I was playing in a line, trying to inflate my pot, but I almost always ended up losing on the river.
But in fact, there are many other variants to count such as stacks, position, and without a doubt that trying to keep as many opponents as possible can increase the chances of winning the hand.