I would highly highly highly recommend Game Code Complete 4! It goes over many many aspects of game engine creation in C++ (Audio, Resource Cache, Rendering, Physics, Input, Scripting and then some). On top of that, it discusses making a game editor in C#. It's the best book I've seen for game engine development fundamentals. Like any game dev book, some of the code is left out of the print and you have to look at the sample code to connect the dots, but it should get you started.

https://www.amazon.ca/Game-Coding-Complete-Fourth-McShaffry/dp/1133776574​

https://www.mcshaffry.com/GameCode/