Auto-translated
In my opinion, learning all the spells is pointless. The hero doesn't move around that often, and most spells just sit there unused, while attack and defense always come into play. Plus, I don't see the point in learning Dark and Light Magic at the same time. You're unlikely to have enough time to both strengthen your own units and weaken the enemy's. Instead, I usually go for Logistics from the sixth level, or Dark Magic.