I am running Red Hat 6.1 at home and Caldera Openlinux 2.2 at work. I am just a begginer. Should I just be concentrating on just one version or should I just concentrate on one particular vendor. Which is better? Or does it matter?

well, i think caldera is based off of redhat... but it all depends on what you already know.. it can't hurt you to have two diferent versions, i started out with turbolinux then had redhat too.. i guess i turned out alright.
each has their differences, but the way i see it is, if you can distingish the difference without getting confused, its all good.

The version numbers differ between vendors, as some release more often than others (or simply use a different versioning scheme), so by concentrating on a certain "version" you are, in essence, concentrating on a certain vendor.

Probably the main thing to go for is to keep current. Regardless of the vendor, newer releases will have a newer kernel, better stability/more bug fixes (one hopes), better hardware support, etc.

it's never a bad thing to get a little more experience under your belt - learning the differences between distros will usually give you a better understanding of what's going on - learning two different ways to do the same thing.

like DMR said tho, i just try to download newer versions of the software i use to keep current. like just downloading the newer version of XF86 or the new kernel, or a newer version of xmms, or any other program i use a lot. that's the great thing about linux... it's little constant upgrades all over the place, instead of just one bulk package.

ahhhh.. a techie's dream come true...