According to the review, this camera is compatible with Pentax K, KA, KAF, and KAF2 mount lenses; screw mount lenses, 645, and 67 series lenses (adapter required)
Can somebody explainwhat mountis better, and what the differences are? What should I be looking for in a beginner-grade zoom lens?
Hi mutty, welcome!
You'll find informations on pentax & k-mounts on this site:
kmp is one of the best info-sources for anything around pentax (It's a german site, but everything is written in english)
In general you can use any GOOD
lens on a pentax-DSLR - but the older ones only in manual modes.