Goodbye:
* Adiós: This is the most common and general way to say goodbye.
* Hasta luego: This means "until later" and is a bit more informal than "adiós."
* Hasta pronto: This means "see you soon" and is similar to "hasta luego."
* Chao: This is a very informal and casual way to say goodbye, similar to "bye" in English.
See you soon:
* Hasta pronto: This is the most common way to say "see you soon."
* Nos vemos pronto: This is another way to say "see you soon" and is slightly more formal than "hasta pronto."
* Nos vemos: This means "we'll see each other" and can be used as a way to say goodbye or to say "see you soon."
Which one to use depends on the context and your relationship with the person you are talking to.