Books

Unlike here, you have to pay. Unless you are a seasoned buccaneer, that is.

b-but I don't want to read books https://youtu.be/alI12mhWZ2Q?t=133

Programming and Architecture

Game Engine Architecture: Powerful and thicc.
Mastering Algorithms with C by Kyle Loudon: Data structures and algorithms explained and written out in C
The C Programming Language: If you can't build your game in assembly, you may as well settle for this. A legendary tome that is easy to find online for free.

Game Physics Cookbook: Lots of tasty game recipes.
Linear Algebra Done Right: For those that want to go further down the linear algebra rabbit hole. Requires an understanding of basic proofs and sets.
No Bullshit Guide to Linear Algebra: Book well-liked by many for being intuitive. There is also a free extended preview for those who don't want to buy the book.
Numerical Recipes in C: The Art of Scientific Computing: Numerical methods like inverting a matrix and solving differential equations.
Ordinary Differential Equations: Learn differential equations from chad Russian mathemetician V.I. Arnold. Easy to find free online.

Real-Time Rendering, Fourth Edition: A must-read for graphics programming. Easy to pirate.
Vulkan Programming Guide: The Official Guide to Learning Vulkan: The official Vulkan guide, not to be confused with the free online Vulkan documentation.