Here are a list of Spells from the Harry Potter series which I found were my favourite!(Even if they may be dangerous spells)
Alohomora
This spell causes locked doors to open. Expecto-Patronum This spell is used to drive off Dementors. Made up of happy thoughts. Lumos This spell causes a small beam of light to shine at the end of the casting wizard's wand. Wingardium Leviosa This spell is used to Levitate objects.
