This page illustrates how the Info-Mac archive is organized. On each site, the full folder name is an alias to the actual folder, which usually has a short abbreviation. Either name can be used interchangeably. People who must use a line interface find the abbreviations faster to use, but the rest of us prefer the longer names seen in Fetch.
Smaller folders represent sub-levels.
Graphics and pictures created by people. Disk configuration and file management utilities and info. Various calculators - scientific, chemistry, etc. The BBEdit text editor plus extensions, tools, etc. All kinds of icons.