Use broad stable categories
A few categories such as school/work, household, photos and records often age better than dozens of tiny folders.
Name files for retrieval
Dates, project names and meaningful descriptions can make search more effective.
Avoid duplicate working copies
Copying the same file into many folders creates uncertainty about which version is current.
Back up important categories
Organization and backup solve different problems; neat folders do not protect against device failure.
General consumer technology information only. Interfaces and menu names change. Before resets, reinstalls, storage changes or other major actions, verify that important data is backed up and use current manufacturer/service-provider instructions.