I'm a numerical methods hobbyist at best, but I do enjoy reading about #IEEE754. I can also recommend the Handbook of Floating-Point Arithmetic, which... is about as dry as it sounds, but a pleasant read nonetheless!
Juggling a lot of different projects means dealing with a lot of different frameworks/technologies which usually would be taxing and difficult, but #Fireship has truly been an invaluable resource for me.
Those 100-second explanations really get you up to speed with the language/framework/library/whatever-specific quirks and features much better than most #documentation 🔥