1. Adiós: This is the most common and versatile way to say goodbye. It's appropriate for most situations, whether formal or informal.
2. Hasta luego: This means "See you later" and is a more informal way to say goodbye.
3. Hasta pronto: Similar to "Hasta luego," but implies a shorter timeframe before seeing the person again. It means "See you soon."
4. Chao: This is a very informal and casual way to say goodbye, often used among friends. It's similar to "Bye" in English.
5. Que te vaya bien: This is a more formal and polite way to say goodbye, meaning "Have a good day/time/journey."
Bonus:
* Cuídate: This means "Take care" and is a more affectionate way to say goodbye.
The best way to choose a goodbye depends on the context and your relationship with the person you are saying goodbye to.