I want to buy my son a gift- an instructional golf book. He is a rank beginner.
How old is he? Really, IMO, one hour with him on the practice green, with a cut-down if need be, 7i and maybe a simple putter in order to give him a feel of the game might be better than looking at a page or video screen. Who ever learned or liked the piano by looking at a page of notes?
You have many good suggestions for books.
I would recommend going to The First Tee program, or some other youth golf group. It would be more enjoyable and he could make friends.