It would help SIGNIFICANTLY if you spent 15 minutes to learn some basic openSUSE Linux concepts: Concepts - openSUSE
The term “repos” is short for “repository” where an openSUSE “repository” is a file server on the internet containing software packaged for openSUSE, packaged in an “rpm” package. The link I provides explains that.
“Packman” is the name given to a repository with rpms packaged by a group of rpm packagers known as the “Packman” packagers. They have a web site here which lists the many software packages they have packaged for openSUSE: PackMan :: home
Videolan is another repository with software packages packaged for openSUSE, but as noted their packages sometimes cause problems with Packman packaged packages (and visa versa) so its typically best not to install applications from both repositories (with the exception being one should get libdvdcss from Videolan).