Welcome to open source! Linux is all about choice and that often means forks
and spinoffs of just about everything. Because it is open anyone can fork
any project,

It can be confusing and nobody would think less of you for being confused.
It is in this chaos that we have strength. If things were centralised and
proprietary then it would be easy to eliminate us. Linux is like a hydra. If
you cut off one head it grows two more. That is why Microsoft (sorry folks
for using the word) finds Linux so frustrating. It is faced with a
competitor that it can't buy or put out of business and the idea of open
source is anathema to them. So whenever you are feeling confused just smile
and think of Steve Ballmer's blood boiling whenever he thinks of Linux.