For managing (storing) files I've concluded that it is impossible to find the ideal hierarchical structure for containing everything, so just go for reasonable structures that might have redundancy - for instance, accepting macos photos' way of organizing photos, adding in another directory for photos not managed by the photos app, plus photos that I include in my journal which is yet another set of directories.

For finding things, I've found it impossible to give sufficiently unique names to everything, and just go for names that are somewhat descriptive. If there is a way to annotate them with descriptions, I try to make the descriptions as complete as possible, am diligent with proper spelling and try to use canonical forms in my descriptions. I also try to settle on a standard set of words I use instead of their synonyms. This allows me to use standard searching mechanisms to find things without worrying about whether I am searching for the right word. I can with confidence to a system-wide search without worrying whether I'm searching using the right words: because I know which word from a set of synonyms to use, because I don't have to worry about finding misspelled variants, and because I know which order I will have put the words in