this block that i made to give exp wont add the exp it gives an error instead can some one help??

local Players = game:GetService("Players")

Script.Parent.Touched:Connect(function(Hit)
    local Player = Players:GetPlayerFromCharacter(Hit.Parent)
    if Player then
        local Exp = Player.leaderstats.Experience
        Exp.Value = Exp.Value + 20
    end
end)

You have 2 problems in here, the first one is that you have to verify first that the object that touched the part is a player/character, second is that you misspelled leaderstats. I knew this because to make a leaderboard you need to make a folder or something that is called leaderstats inside the player and that Leaderstats won't work.

I'll explain how I verified that the object that touched the part is a character.

local Player = game.Players:GetPlayerFromCharacter(Hit.Parent)

By using :GetPlayerFromCharacter() you can get the player, but if the object you put -->()<-- here is not a character it then gives you nil. So if it's not a character the code above is the same as this : local Player = nil , nil basically means nothing or doesn't exist.

if Player then
    local Exp = Player.leaderstats.Experience
    Exp.Value = Exp.Value + 20
end

if Player then check's if the Player is true, so it's the same as this : if Player ~= nil then, ~= means "is not equal to", the opposite of == which means "is equal to".

Now, if the player is not nil or true then it would run the following code :

local Exp = Player.leaderstats.Experience
Exp.Value = Exp.Value + 20

You now know this won't give any errors because you know, that player exists, Remember the error?

12:31:10.691 - Workspace.Part.Script:6: attempt to index a nil value

12:31:10.691 is the time which the error happened. Worspace.Part.Script is the script that caused the error. :6: is the line in the script which caused the error. attempt to index a nil value this means that you tried to index a nil value, or in other words, you tried to do something to something that doesn't exist or nil.

You have to make sure that a player activated the hit function as anything that touches the part will activate the fuction. Because every player has a humanoid in them, you can check if a player triggered the function bu asking:

if H:FindFirstChild("Humanoid") then