Informal:
* Do widzenia! (Do vee-dzen-ya) - This is the most common and general way to say goodbye. It literally means "See you!"
* Pa! (Pa) - This is a very informal and casual way to say goodbye, often used among close friends.
* Cześć! (Cheshch) - This is also informal and means "Hi/Bye."
* Narazie! (Na-ra-je) - This means "See you later!" and is another informal option.
Formal:
* Do zobaczenia! (Do zo-ba-chen-ya) - This means "See you!" and is more formal than "Do widzenia."
* Żegnaj! (Zheg-nay) - This is a more formal goodbye, similar to "Farewell" in English.
Other options:
* Miłego dnia! (Mee-łe-go d-nya) - This means "Have a nice day!"
* Miłego wieczoru! (Mee-łe-go vee-cho-ru) - This means "Have a nice evening!"
Which one to use:
The best way to say goodbye depends on your relationship with the person and the situation. If you are close friends, you can use any of the informal options. If you are speaking to someone you don't know well, it is best to use a more formal option.