IMO set him up with some of the modern engines and tutorials… Godot 4, Unreal etc…

actually if you are looking for some stuff to have ready for him.

https://www.humblebundle.com/books/game-programming-with-c-unreal-packt-books?hmb_source=&hmb_medium=product_tile&hmb_campaign=mosaic_section_1_layout_index_2_layout_type_threes_tile_index_1_c_gameprogrammingwithcunrealpackt_bookbundle

If he has access to youtube there’s also lots of really good tutorials etc… out there. Heartbeast has some awesome ones for godot etc…

also worth going further on library size. There’s twice as many steam deck verified games, than there are ps4 titles. Not counting any titles that work in steam deck but haven’t bothered to be verified.