Most of this is OpenGL based.

Jorge Rodriguez's Game math playlist. More about the math but lots of C++ code as well. Examples are mostly using OpenGL but the videos include general game math info aside from the OpenGL.

https://www.youtube.com/playlist?list=PLW3Zl3wyJwWOpdhYedlD-yCB7WQoHf-My

The Cherno's old OpenGL playlist. (The new one moves waaaayyyy too slow and isn't as good IMHO) Watch Eps 1-3 (maybe the first 4 non-episodes are helpful as well, not sure) to get GLFW setup and maybe check out Jamie Kings videos below and then come back to this after. Or keep going.

https://www.youtube.com/watch?v=vWU8EltWTfM&list=PLlrATfBNZ98fqE45g3jZA_hLGUrD4bo6_

Jamie King game engine playlist. I would recommend using GLFW instead of QT (using The Cherno's code from EP 1-3 above) and skipping the GTesting. Not the greatest audio. Has some great insights into how OpenGL and works as well as general info not found elsewhere.

https://www.youtube.com/playlist?list=PLRwVmtr-pp04XomGtm-abzb-2M1xszjFx

SIGGRAPH University : An Introduction to OpenGL Programming

https://www.youtube.com/watch?v=6-9XFm7XAT8

Brian Will OpenGL playlist using https://learnopengl.com/ as a guide.

https://www.youtube.com/watch?v=hPmEyAXdOdY&list=PLIbUZ3URbL0ESKHrvzXuHjrcLi7gxhBby

If you want to go DirectX route, this is about as good as I've found to get started.

ChiliTomatoNoodle - C++ 3D DirectX Programming

https://www.youtube.com/playlist?list=PLqCJpWy5Fohd3S7ICFXwUomYW0Wv67pDD

Check out all the channels listed for other videos/playlists.

11 minutes ago, 8Observer8 said:

I see the "Unreal" tag.

I missed that.

For Unreal C++ programming, by far the most popular course is

https://www.udemy.com/course/unrealcourse/

I've never seen it and it costs money (under $20 on sale). It's over 40 hours long.