This is a text document made in Libreoffice which documents all folders in the userdata folder (EA Games/The Sims 2) and the TSData/Res folder in the game files (The program files directory)

It is listed in tables.
All table contents are colour-coded based on each folder's regenerative properties which means that you can check whether it's safe to delete something such as the "Teleport" folder.
It lists common and uncommon CC installing directories.
You can use this with tutorials if it mentions a userdata or TSData/Res directory in order to know what you're modifying.
You can use this if you are a creator and one of your uploads has an uncommon installing directory in order to explain to simmers where to download the file(s) you have uploaded.
You can also use this just for curiosity.

Note: Some information may not be accurate. If you do find something which is wrong or you have more information to add, please reply to this post and notify me to add it.

You can download from 2 versions: an .odt file or an .rtf file, but please note that the RTF file might have some weird formatting as I had originally made this as an .odt file.

Thank you, very useful indeed!