First strike

[Tetsomori]

Does first strike damage go on the stack still?

[BlackJester]

Does first strike damage go on the stack still?

Not really sure what you mean, but here:

510.1. First, the active player announces how each attacking creature assigns its combat damage, then the defending player announces how each blocking creature assigns its combat damage. This turn-based action doesn't use the stack. A player assigns a creature's combat damage according to the following rules:

[Tetsomori]

A guy i played yesterday told me first strike still uses the stack. He attacked with a 3/2 first strike i blocked with a 4/4 he {alter reap} first dmg on stack

[BadLuckIrish]

He could reap it after declare blockers but if he does no combat damage will be dealt. Noone has prioty during damage being dealt.

[BlackJester]

To be clear, combat damage no longer uses the stack. However, after first strike damage has been dealt, triggers go on the stack and player get a chance for fast effects before the second combat step. So his terminology is wrong, but he can still deal 3 damage in the first combat step and then {Altar's Reap} before the second combat step.

[BadLuckIrish]

To be clear, combat damage no longer uses the stack. However, after first strike damage has been dealt, triggers go on the stack and player get a chance for fast effects before the second combat step. So his terminology is wrong, but he can still deal 3 damage in the first combat step and then {Altar's Reap} before the second combat step.

But only if a trigger went off?

[BlackJester]

No, it'll happen anyway.