Experience
The experience bar shows your progress toward the next level. Rested experience has a separate fill so you can see the bonus remaining.
Right-click to switch to the compact 8-pixel bar, or move the control under the picture to compare the two. Use the settings to choose labels and whether gains briefly appear above it.
Reputation
When you watch a faction, its reputation appears in a separate bar. Left-click that bar outside combat to open the reputation panel.
Use /rik move to position the bars alongside your action bars or elsewhere on screen.