Get Easy Experience:
Reach the room in the Cursed Cave that you have to throw the skeletons into the barrier but instead of throwing them kill them. The skeletons will keep respawning and you will be able to gain as many levels as you want.

Defeat Tortured Zombies:
The easiest way of defeating the tortured zombies at the Ruined City of Adoni is to press Circle and X when you engage in combat as this type of jumping downward slashing attack will inflict 90% damage on them.