Here is a bit of advice to someone raw to openSUSE,
This might be the preferred order when considering options installing software. Note that a “managed package” installation is preferable to ease initial install and to automatically update later on.
1a. Use YAST to search for and install packages
1b. Use zypper to search for and install packages
2. Install packages from software.opensuse.org: Download openSUSE 11.4
3. Use RPM to search for and install packages
4. Install generic RPMs from repositories not sanctioned by openSUSE (note this might not auto update)
5. Install from source (note this will not auto update and install might be difficult)