I need to make a way so at the end of my round based game the winner gets points...?

Server Script

game.Players.PlayerAdded:Connect(function(Player)
    local bool = Instance.new("BoolValue")
    bool.Name = "Status"
    bool.Value = false
    bool.Parent = Player

    Player.CharacterAdded:Connect(function(Character)
        local Humanoid = Character:WaitForChild("Humanoid")
        Humanoid.Died:Connect(function()
            bool.Value = false
        end)
    end)
end)

function Begin()
    for i, v in pairs(game:GetService("Players"):GetPlayers()) do
        v:WaitForChild("Status").Value = true
    end
end

workspace.Part1.Touched:Connect(Begin) -- Whatever event you want to check that a round is starting here

function End()
    for i, v in pairs(game:GetService("Players"):GetPlayers()) do
        if v:WaitForChild("Status").Value == true then
            v:WaitForChild("leaderstats"):WaitForChild("Points").Value = v:WaitForChild("leaderstats"):WaitForChild("Points").Value + 25
            v:WaitForChild("Status").Value = false
        end
    end
end

workspace.Part2.Touched:Connect(End) -- Whatever event you want to check that a round is ending here

Your code should look something like this. The Bool can go anywhere inside the player, as long as you can read it.

We can use the Player.CharacterAdded event to get the Character of the player and their corresponding humanoid.

When the humanoid dies, the bool will return to false

This example assumes you already made a leaderboard using leaderstats and Points, though the name of the folder / model depends on how you actually scripted it.