You can consider my answer on U&L which partly answers your question.
First of all, answer the question. "Your" openSUSE uses zypper package manager as the default, which is not so bad. You can have a look at the documentation as Gerald Schneider commented for how to use it. You named YaST, which can be used to install other package managers such as (partly taken from here):
- apt4rpm or zypper-aptitude which let you get the feel of
apt(-get), the package manager for Debian + Ubuntu + Linux Mint and all Linux Distributions build in Debian
- Redhat, fedora and CentOS are using
dnf/yum package manager, which are also RPM-based package managers, dnf actually being a fork which just uses libsolv as dependency resolver.
BUT the big problem problem will be to find repos, as you probably want to use the (non-zypper) package manager to install software - and there will not be many repos for them. So to adress this, there comes the frustrating part of this answer. You can of course always build the Debian packaging system (dpkg/apt) from source.But I would be doing you a huge disservice by not telling you why you shouldn't do that, so I'll do that for you as well. SUSE is built around RPMs and while I like dpkg better than RPM, I would never try to convert an RPM based distro to a debian based distro because they're architected differently. This is partly taken from here, where there also is more Info.
