macOS ??good c++ tutorial site??games??

I don't know if you've got any C++ experience but writing a game is a pretty big challenge - unless you mean a simple board game sort of thing. If you mean an all action shoot-em-up then that's pretty hard. My advice is to check out some of the pre-rolled SDKs (see links) that will allow you to concentrate on programming the game rather than the graphics engine (unless of course that's what interests you).

Torque SDK
Unity Engine

there are probably others