Tips on creating a good combat system?

I will suggest you use these five tips :

1. use .Touched, make the player hitbox bigger to make up for the delay, use transition animations. also try making a cooldown animation, moar particle effects to hide the bad animations.

2. try using delays in the function , use raycasting to find who you're hitting, try making a level system to make it better, for smoothness try making the place as NOT laggy it can get. for the delay, make it so its 1/2 of the move use time.

3. try making a priority system to let the system run smoother, like this one:

local priority = nil
local punch = 1
local block = 5
local kick = 10
function determine(punch,kick,block)
	punch = punch + 2
	kick = kick*kick
	block = block + block
	if (punch >= kick && kick >= block)
       		// do what you want to do
              punch = 1
	end
        if (punch >= kick && kick >= block)
       		// do what you want to do
              punch = 1
	end
        if (punch >= kick && kick >= block)
       		// do what you want to do
              punch = 1
	end
end

4.try computing how much time do you need to do the move, and make the animation that long.try using a tiny block that tracks where the hand is at( or foot ),that kills anyone that touches it except the LocalPlayer.

5.make a hurt hitbox for every move,if anyone except the LocalPlayer touches it,it hurts them. as incapaz stated above:" you could check if the part that touched it and if the attacker then take damage. and a bool value in the attacker that is set to true when the animation is set".