I have Players 1, 2, and 3 vs Players 4, 5, and 6 in a defense game. My problem is, I want if for example Player 1 kills a unit from Force 2 (Players 4, 5, and 6) to get "X" amount of Experience and "X" amound of Money for that kill. My problem is...I want it to work for all players accordingly and to be preserved for the whole game (So that if Player 1 kills again, he gets it...pretty sure you already understood the xD).

I thought I already had a good way of doing this by having:

Player 1
::Conditions::
Current Player kills at least 1 "unit"
Force 2 has suffered exactly 1 death of "unit"
::Actions::
Give Exp
Give Money
Preserve Trigger

This is of course with a trigger for all players always setting their deaths to 0. The bug in this is...if player 1 kills a unit from player 4 and so does player 2...then if player 1 kills a unit from player 4...both player 1 and 2 are gonna get the experience and money....so I need the best way to do this plzz! All I need is this help and my map will be done!

use kill score (points) instead of the value of kills and reset it for the player in your actions:

trigger:
Player 1
::Conditions::
Current Player has at least 1 "killscore"
Force 2 has suffered exactly 1 death of "unit"
::Actions::
set kill score for Current Player to 0
Give Exp
Give Money
Preserve Trigger

Make sure that the deathcounts will be resetted after the last player gained his money and Exp. (DC reset trigger coul be in All Players, too, I believe).

thanks man will give it a test

That method is not without it's drawbacks. For example splash kills will cause trouble.
Here are all common kills to cash methods.
Read it to find out which method suits your map best.

Kill cannot be set, so you have to use Kill Score, just note that Kill Score is not the same as Kill, Kill Score is a set number depending on what unit you kill, it gives you that score. You will want to use Kill Score, but you might get glitches every once in a while because it is a defense map, and it might not update fast enough to detect it properly when multiple units are killed at once. You might have to settle for a close-to-perfect system, but not completely perfect.

Well I did the trigger and it seems to not work that often...I was testing with friends and teal had like 20 kills to browns like 6 and Brown had like 2200 exp to teals 100 exp...it seems to stop working or slow down after like 2 mins in the game...idk what the problem is, but this is a big part to my map.

Did you use at Least for your conditions, or exactly?

this shouldn't happen.
Post the exact trigger(s) or better the whole map