resource recommendations - How to keep design files organized on your computer?

I have a significantly large amount of files on my computer that I need for work and/or future reference.

I am terrible at keeping them organized. My computer is a mess. I believe this is because I simply cannot find a good system to stick to. (I am super organized in the real world, where I have a good system.)

I have tried to find advice for a good organization system online, but haven't found any I could use– one specifically for designers.