I'd like to offer some tips for those who aren't very good at organizing:
- Allow tons of subfolders in your resource.cfg file. Doesn't matter if you think you'll never use them, having more than necessary is always going to be better than burying something too deep and working yourself into a frenzy trying to figure out why it won't work.
- Actually use subfolders. Everything except script mods can be as many folders deep as you want it to be. I have dozens of clearly labeled folders in my mods folder so that I know where to find everything, in case I ever want to delete or modify one specific piece of content. I have one folder for each category in Create-A-Sim, and for each sub-category within those categories. I also have one folder for each room in Build/Buy mode, and one folder for each item type within those rooms.
- RENAME THE FILES. Include the author's USERNAME (not their preferred handle) and the name the mod/CC is titled wherever you found it from. This is so that, in the future, when, not if, when the game updates and inevitably breaks your CC, you know exactly what to look up to find it again, so that you can update it. I label everything as "Username - Mod_Name.package."
- Put script mods in their own folder. I personally find that putting all my script mods into one folder gets confusing. Therefore, since script mods can only be one folder deep within the Mods folder, I recommend putting each into their own folder named with the above-mentioned naming scheme; Username - Mod_Name. (I'd also advise this for Tuning mods, but it's less necessary for them.)
These are just the methods I use to keep my Mods and CC organized. They aren't any kind of standard, but I figure some people might be able to benefit from them, so I may as well share them.