How can i make players no CanCollide?

Hello nikoladzon! Insert a Script at WorkSpace and place this:

script.Parent = game:GetService("ServerScriptService")
local PhysService = game:GetService("PhysicsService")
local PlayerGroup = PhysService:CreateCollisionGroup("p")
PhysService:CollisionGroupSetCollidable("p","p",false)

function NoCollide(model)
    for k,v in pairs(model:GetChildren()) do
        if v:IsA"BasePart" then
            PhysService:SetPartCollisionGroup(v,"p")
        end
    end
end

game.Players.PlayerAdded:connect(function(player)
    player.CharacterAdded:connect(function(char)
        char:WaitForChild("HumanoidRootPart")
        char:WaitForChild("Head")
        char:WaitForChild("Humanoid")
        wait(0.1)
        NoCollide(char)
    end)

    if player.Character then
        NoCollide(player.Character)
    end
end)

I hope that helps you. Good luck.

Thanks