Start with the system you're on Or, pull out an emulator & go with a system where people may've been more prone to develop in assembly (eg 6502 & then try make

Start with the system you're on Or, pull out an emulator & go with a system where people may've been more prone to develop in assembly (eg 6502 & then try make a rom that'll run in an NES emulator) For the most part once you learn one assembly language you've learnt them all. After load/store/registers/arithmetic/jumps the rest is just details (ofc, if you're programming assembly beyond a hobby, the devil is in the details for performance)