Handmade Hero is a bad idea for anyone wanting to learn how to make a game in C or C++. Casey intentionally avoids using standard libraries and frameworks and his irrational hatred of high-level code and modern standards will lead developers astray and waste their time.

Even if you're using C you don't need to implement your own renderer or do half the things he does. Get a library like SDL3 to handle the basics, maybe use Lua/LuaJIT for scripting. Learn OpenGL or Vulkan. Stay away from HH and Casey Muratori until you're experienced enough to tell the difference between his wisdom and his bullshit.