There is PvE experience which allows you to gain PvE levels. There are 40 PvE levels. You will find that it is quite easy, compared to other MMO's, to level in PvE, this is intentional. There is a HUGE emphasis on making the game "fun". PvE levels allow you to "buy" skills and abilities. There is also special PvE skills and abilities that you gain depending upon which tree you pick to specialize in.Always buy all PvE skills/abilities that you can, since there is no hurt in having them. There is PvP experience, which allows you to gain PvP levels, this is called "Renown". There is a total of 80 PvP levels. PvP levels allow you to gain a few new skills, abilities, or attributes, depending on where you place your Renown points. You get 1 point for each Renown level you gain.
There is also "Influence" experience. This is separate from Renown and PvE experience. This is limited to a PQ area.When you first start out there is only one PQ in the very lobie area. As you move up in levels and explore more of the world you will find other PQ's. There are three levels for each PQ, each level allows you to pick an item that you want. In the lobie areas the items are not that big of a deal, however after you hit about level ten, you will start finding PQ's that reward blue items, these are very decent! The top players get extra loot that they make pick from the end PQ treasure chest. Understand that after you hit the third level you get to pick a level one item, a level two item, and a level three item. If you only complete the first level, you can only pick a level one item from the NPC.