To get easy XP early in the game, go to Lyta Oasis in Gormott Province. It is located towards the lower side of the starting island. Once there, you can find a group of enemies that will not attack until you begin the encounter. They are not too hard to defeat, especially if you take advantage of their weaknesses. Once the enemies have been defeated, find an inn and rest with all the party members that were part of the encounter. Then, go back and fight the enemies again. Repeat this process as many times as desired. Additionally, make sure not to die, as you will lose all earned XP and have to start over again.