I've had the same folder system for nearly a decade, which is a while for me, as I am young. Four main folders which are: -Activity: social planning, ideas, games, holiday stuff, etc. in respective subfolders. -Education: gradeschool, higher education, certificates, trainings, religious notes, etc. also organized by topic/semester as applicable. -Management: responsibilities, work, taxes, health, family, housing, and all other boring but needful things. -Media: mostly pictures and videos, organized by year. Some other stuff like journal entries. I use the same system in my email and really any program that allows compartmentalization. I also keep other folders empty, like downloads, so I never have to guess where a file could be.