[Katharsas]

Maven Central is the place where the libraries are hosted, but not the place where they are found by users. Use Google/Stackoverflow/Reddit and simply search for what you want.

Searching for "command line argument parser java" immediately leads you to libraries and infact lists of libraries (see https://stackoverflow.com/a/7829772), of which most are going to be available on Maven Central.

Then you do your research that the library you are looking at looks valid and is trustable (!) by checking out the info available on it, maybe make another search to find opinions on it.

Then when you have decided to try it, look at its docs to find out where it s located on Maven Central and use it from there.