Graphics Education
So, learning about graphics is a journey (a life journey, for some!). Books, papers, samples, games, demos, friends...
Here's a new resource you should probably subscribe to if you're into that: the Microsoft DirectX12 Graphics Education channel in YouTube. Yes, it has stuff on DirectX12 specifically, but you'll also find videos on porting from DirectX11 or porting OpenGL ES to Windows, with more content to come, so it's worth keeping an eye on.
Enjoy!