how do i check if a player is touching a part?

Using part's Touched event:

The code below says when the parts touch event is fired, call the following function:

part = game.Workspace.Part

part.Touched:Connect(function(itemTouchingPart)
    print("Item touching part: ", itemTouchingPart)

    --Now we're going to see if the thing touching the part is a person by checking if it's parent is one of the players in game
    if(itemTouchingPart.Parent and game.Players:FindFirstChild(itemTouchingPart.Parent.Name))then
        print("There is a player touching the part!")
    end

end)