Like a couple others here, I don't see an introductions thread. I've written about GNU/Linux & libre software in general since about 2004, and have been on a bit of a hiatus over the past couple years. I was affiliated with LXer.com and later launched Blue GNU. The latter is defunct, but you can probably check out some old stuff via archive.org.
I started with Red Hat Linux 5.1 back in the '90's and tinkered with Mandrake 8., SuSE 8.0, etc. I stuck with SuSE for a while before switching to Debian 5.0. I've used mostly Debian and (K)Ubuntu since about 2007. I have done lots of tinkering, successfully configuring at a basic level things like SQL servers, e-mail, NFS, Apache, VPN, even Asterisk. At any rate, I would like to shoot for certifying (Linux+/LPIC or RHCSA/RHCE) in the near future. I've done an awful lot of this stuff, but there are some things I have yet to do.
I have not done things like iptables, SELinux, virtualization, nor have I had much experience with Red Hat or it's derivatives - or even RPM-based distros - in the last several years. So I have much to tinker with yet.
Anyhow, I am sure to goof up stuff and wind up asking questions, so I thought I'd introduce myself. And yes, I'm reading the documentation - as much as can at any one time.