I run Fedora, mostly because I have since before there was Fedora and there was only Red Hat. Ubuntu seems to be more popular these days. One fellow in the know says that neither is really "better", they are just different each in their own way. Much linux know-how is the same from distro to distro, but you should be aware that all my experience is with Fedora systems and I do give details, and neither know (nor care really) how applicable they are to other distros.
The Fedora Forums now seem to be much more useful than the Red Hat support pages Some general links:
The following will yield a wealth of information:
And here is the rest of the story:
Adventures in Computing / firstname.lastname@example.org