I use a (slight) variation of the "Johnny Decimal" System (https://johnnydecimal.com https://johnnydecimal.com). Essentially I have a folder called "library" wi

I use a (slight) variation of the "Johnny Decimal" System (https://johnnydecimal.com https://johnnydecimal.com). Essentially I have a folder called "library" with subfolders like this: - [1] Personal -- [11] Finances --- [11.01] 2017 --- [11.02] 2018 -- [12] Travel - [2] Work - [3] Education ... [94.xx] is my special inbox folder which I use when I am to lazy to immediately sort something. The website says that you should under no circumstances create subfolders within a [xx.yy] folder. I do break that rule - e. g. [31.04] refers to a specific course at university. Within that folder I have subfolders for specific assignments etc. The alternative would be either a (for me too) large amount of [xx.yy] folders or a messy course folder. The big advantage of the system is that everything is identifiable by a simple number, which makes searching in spotlight really easy. E. g. searching for "[12." brings up all the folders for my trips in the last years. I have been quite happy with the system over the last year or so and would recommend it.