Favorites listed in alphabetical order :).

• Accio - summon an object
• Alohomora - open locked objects
• Aparecium - show invisible ink
• Confundus - confuses another person
• Expelliarmus - disarms the other person
• Ferula - make bandages
• Fidelius - hide a secret in someone
• Finite Incantatum - stop any current spell
• Impedimenta - slows down an advancing object
• Incendio - start a fire
• Legilimins - probe in someone's mind
• Lumos - makes wand have light at the tip
• Mobiliarbus - move objects with wand
  • Mobilicorpus - move unconscious body
• Obliviate - erase memory
• Petrificus Totalus - body bind
• Repairo - repairs things
• Stupefy - knocks someone down
• Wingardium Leviosa - make an object fly

Unforgivable spells:

• Avada Kadavra - murders victim
• Crucio - tortures victim
• Imperio - puts victim in trance-like state (puppet)