How do you reference the head of a character?

Don't get too aHEAD of yourselves! You still need the character! Get it?

Okay, I'll stop

If we dive into the Player object

We can see that the Player has a property that we might like.

Character.

The Character property of Player returns the model that we control whenever we're playing. What's also awesome about this property? It's not Read - Only, so we can change it!

But we're getting off - topic, and I'm a professional scripter, I don't go to OT(or do I?)

Character objects also have a child, named Head, which is the head we're looking for!

BAM IM AMAZING AT ANSWERING.

game.Players.PlayerAdded:connect(function(plr)
    print(plr.Character.Head.Name)
end)

BAM

ERRORS

Uh oh, errors!

Why is this erroring?

We are trying to access the Character of the Player while it might not be loaded yet! Scripts load the fastest in Servers, which is a bad thing if you're not waiting for anything because it'll cause everything to error.

How do we wait for the Character

:WaitForChild("Character")?

No, for one, the Character is not a Child of Player, but rather, a property.

How then? There's an event for the Player named CharacterAdded, which fires whenever the Character of a Player spawns!

So we can use that in out scripts!

game.Players.PlayerAdded:connect(function(plr)
    plr.CharacterAdded:connect(function(char)
        local head = char:WaitForChild("Head") --Just incase Head hasn't loaded yet.
    end)
end)

And there we go!

What if you got the char, by a touched event?

Yes, I totally thought this up myself

The Touched event returns a Part

Part.Touched:connect(function(hit) --Hit is the part that touched out 'Part'
end)

If a character touches it? It simply returns a part of the character, not the character itself. So, since it's a child of Character, we can so script.Parent!

part.Touched:connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") then
        local head = hit.Parent:WaitForChild("Head")
    end
end)

pls at least give me some rep, I'm battling against @BlueTaslem here.

If you have a character, the head is just going to be character.Head, since the head of a player is named "Head".

If you're handling this from a LocalScript, you can get the local Character like this:

local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:wait()

local head = character.Head
-- do whatever to `head`

If you're handling this from a Server Script, you can get each new character like this:

function newPlayer(player)
    player.CharacterAdded:connect(function(character)
        local head = character.Head
        -- do whatever to `head`
    end)
end

game.Players.PlayerAdded:connect(newPlayer)
for _, player in pairs(game.Players:GetPlayers()) do
    newPlayer(player)
end