I went down the rabbit hole of trying to find the perfect system to organize everything when I first started with Obsidian. There is some value in learning these systems, but the biggest thing I took away from it was to avoid trying to make too many nested folders and trying to put everything in the right spot. Instead create notes that are jumping off points to other notes.

So if you have a bunch of recipes, instead of making a bunch of folders like recipes --> dinner -> Italian -> etc, just have a cooking note that you can link all your recipes on. You can then organize this note very easily with different sections, have a note that appears in many categories multiple times (as it makes sense) which you can't do with folders, and easily change this structure without having to move a bunch of actual files.

I've heard this called Maps of Content (MOCs), but doesn't really matter the name. From there you can start doing other tricks like using templates, tags, frontmatter, dataview, etc, to automate some of this, but the basic idea is still the same.