I don't know if RedHat comes with any good HTML editors, but I did a search on www.google.com/linux
(a.k.a. G4L) and found a pretty good supply of reading for you.
I searched for html editor
and I went to the RedHat website and found that it comes with an HTML editor called "quanta" for KDE. I don't know what RedHat version you have, but this package list was for RH 8.0. If it doesn't come with your version of RH, the G4L search above should give you some ideas to start with.