Okay...
XP bar -- the blue is your current experience, the green shows your rested experience. That is, the green only appears if you are rested at all and shows how many "bonus" experience points you will gain from killing mobs. Every time you kill a mob the border between the blue and green will move to the right showing you gained experience and used rested experience. When you have used up all of your rested experience, the green bar will go away. Put another way, the blue bar shows how much experience you have, the green bar shows you how much more you can earn and still gain bonus experience points.
The reputation bar automatically tracks whichever faction you last earned reputation for. It sees when you gain faction and automatically selects that faction for display -- that way you don't have to keep going back to your faction dialog to change which faction you are tracking.
Finally, as for Titan, you do not have to install any plugin for Titan and nUI to work together. Just install Titan and log in. That's it. nUI will detect Titan is present and move the console and/or dashboard as required to allow for Titan's bars.
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