How to make the player run straight with the ability to strafe left and right?

I have this code and it works but it disables going left or right.

game:GetService("RunService").RenderStepped:Connect(function()
    humanoid:Move(Vector3.new(0,0,-1), true)
end)

I want to be able to go left and right too, and not just traight. Is there a better way of doing this?