Nandgame is very good, id skip the nand2tetris as its a bit outdated. My recommendation is to move to playing around with microcontrollers and writing stuff i

Nandgame is very good, id skip the nand2tetris as its a bit outdated. My recommendation is to move to playing around with microcontrollers and writing stuff in C for them, compiling it to assembly and understanding what each instruction does. Past that, there is the whole "how to write an OS" which is a fairly complicated topic. You can skip that as you are never gonna really be in that area unless you are working on consumer facing product that needs some ABI. You can go straight to using ghidra to decompile linux executables, and understanding things like elf files, dynamic linking and so on.