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if you had to recommend one book, which would it be for someone starting off with graphics for the first time.

Michael Abrash's Graphics Programming Black Book https://www.drdobbs.com/parallel/graphics-programming-black-... released online for free in 2001

I'd recommend "Computer Graphics: Principles and Practice" by Foley and van Dam. It's highly regarded and is on 2nd or 3rd revision.

I do as well, it is a standard reference in graphics programming at university level.

First edition used Pascal, then C and the third uses a mix of C++ and C#.