Make Sure to Complete Quests and Use SP to Learn Skills
Outside of story missions and optional battles in Fire Emblem Heroes, there’s a few options you can use to get extra items and customize your characters. When on the home menu, you can click the angel fountain on the right side of the screen to bring up a list of quests and missions. Each of these will have certain requirements, like defeating a specified amount of lance wielders, and when completed will reward you with an item or orbs. These quests will refresh at the specified times, and taking advantage of them can be a good way to earn a tidy amount of bonuses.
When characters level up in battle they’ll earn SP in addition to stat bonuses. This SP has to be used in the menu to teach characters skills that will take effect in battle. To do this, tap the Allies tab on the main menu and then select “Learn Skills.” You’ll unlock more skills as characters level up, so keep learning new ones and find which you like best.
