So this is my studio lighting diagram that I made for VintageGirl.
Others might enjoy it.
I just made it up and it's not based on anything other than my dumb brain, so feel free to knock it about...
It is a basic setup, intended to give a stable foundation to set your lights to so you can have good control and yet not spend too much time and grief wrestling with things...
This is more specific to lighting beginners.
Anyone more advanced than that likely knows far more than me, so it might not be terribly useful.
It also should create some rather dull, flat lighting.
If you use it, try experimenting with moving one light closer to brighten one side and increase shadows on the other side to add depth.
Once you have shadows, you could adjust and fine tune them by moving the light around the circle.
Please don't laugh too much at my handwriting. It looks a bit less childish on paper. :)