I’m on “record” as only recommending 4 and ONLY 4 repos. Those 4 are OSS, Non-OSS, Update and Packman.
OSS - this in essence corresponds to the DVD - ie the main repository, open source software only
Non-OSS - this is Non free (as in freedom) software, such as Flashplayer, Java, Opera, IPW-firmware, RealPlayer etc. (as packaged by Novell/SuSE-GmbH for openSUSE)
Update - Repository for official security and bugfix updates (as packaged by Novell/SuSE-GmbH for openSUSE)
Packman - a 3rd party volunteer repositoriy offers various additional packages for openSUSE. It’s the largest openSUSE external repository. Its package replace many broken/crippled Novell/SuSE-GmbH packaged multimedia. Note it does NOT work well with the videolan repository
Yes, in OSS repository. I always disable my package manager link to the DVD
One can get various versions of these from many repos. Note various versions. I recommend only OSS, non-OSS, Update and Packman, although for firefox experienced users may wish to try the mozilla directory.
Yes. For example Packman and videolan do not work well together. And sometimes even though an app installs, because it has some of its packages from Packman and some from Videolan, it won’t work well.
This is a list of my Repo’s and they do all that I need to get done. The only conflicting repo’s I know of are Video Lan (aka vlc) and Packman, most recommend that you use Packman over vlc.
Also you might need the ATI or Nvidia repo depending on what graphics card you have. In any event I recommend that you only enable the repo’s you must have to make your system work properly, and I believe these to be the basic repositories that will get most systems running. As for the conflicts you will need to decide what best fits your setup, in some cases you will need to deinstall one package to install the “updated” one, sometimes you you need to change vender to install the package(especially true for Packman repo stuff). Just look at the list of options, think and decide before you click “OK”
Sorry I really can’t be much more help than that, maybe someone here has more info you can use.