Apt
apt is the software manager that minux uses, it downloads files from the real internet.
here you can find more information on how apt works and how to run a repository yourself.
Software compatibility - extra instructions a program can send trough apt on how to find and (un)install your software
adding a repository - how apt knows a server is a repository
listing available software - how apt knows what software packages it has
installing/updating/removing software - how apt knows what files to download and where
-- main apt repository
https://minux.cc/apt/ - the manifest files tell apt what files to look for, the repository contains the actual files.
these files are all text files and can be opened with any text editor, they contain either configuration data or lua code.