Combat & Defense:
* Stupefy: A powerful disarming spell that renders the target unconscious. Used extensively throughout the book.
* Expelliarmus: The disarming charm, famously used by Harry against Voldemort in the first book.
* Protego: A defensive spell that creates a shield against incoming attacks.
* Imperio: The Imperius Curse, a mind control spell used by Death Eaters.
* Cruciatus: The Cruciatus Curse, a spell designed to inflict excruciating pain.
* Avada Kedavra: The Killing Curse, a spell that instantly kills its target.
* Sectumsempra: A powerful cutting spell invented by Severus Snape.
* Diffindo: A severing spell, useful for cutting through ropes or other obstacles.
* Reparo: A spell that repairs damaged objects.
* Accio: A summoning charm, used to bring objects to the caster.
Other Spells:
* Lumos: Creates light at the tip of the wand.
* Nox: Extinguishes the light created by Lumos.
* Alohomora: A spell that unlocks doors and other objects.
* Wingardium Leviosa: The Levitation Charm, used to lift objects off the ground.
* Episkey: A healing spell that heals minor injuries.
* Revelio: A spell that reveals hidden objects or information.
* Fidelius Charm: A spell that hides secrets and information.
* Obliviate: A spell that erases memories.
Specific Spells & Charms:
* The Patronus Charm: A powerful charm that conjures a protective guardian in the form of an animal. This is a crucial spell in fighting Dementors.
* The Patronus Charm in the Form of a Stag: Harry's Patronus takes the shape of a stag, echoing his father's Patronus and creating a powerful link between them.
* The Patronus Charm in the Form of a Doe: Professor Dumbledore's Patronus takes the shape of a doe, hinting at his romantic connection to Harry's mother.
Remember: This is just a selection of spells. Many other spells are used in the book, but these are some of the most memorable and important ones in the context of the story.