I really need recommendation for this. So my character can die from fall damage and stuff but i wanna add something like you were killed by “this” and stuff and i really wanna check who last did damage to me. which is the best way to check this?.

Hi, you could use the Event Any Damage and save/set the last Damage Causer. You can set the Damage type, Instigated By (controller) and damage causer (actor, like a bullet)