Certain locations will not allow you to travel there unless you are a certain level. For example: you need to be level 5 in order to travel to Townshire.
Experience points required for each levelEdit
|Character Level||XP Required to next level|
Each time you gain a level, you will get a report card, stating all the quests you have done and the number of creatures you have slain. You also get a commentary about your performances: