When kids in https://old.reddit.com/r/opengl/ ask about a good starting project, I usually recommend making a glTF viewer. It’s good because it’s a scalable project that you can take as short or as far as you care to go. At a minimum, you can just get solid colored triangles on the screen in generally the right shape. But, if you find yourself having fun, you can end up building a full-featured scene renderer to rival https://google.github.io/filament/Filament.html

On another thread, people were wondering where all the hackers went.

Here's one, and it's a lot of fun! Can't wait to give this a try this weekend.

8MB for a low-poly untextured 3D model in binary format. Something is horribly wrong there.