Informal:
* Zàijiàn (再见) - This is the most common way to say goodbye. It literally translates to "see you again."
* Bái bái (拜拜) - This is a more casual way to say goodbye, often used with friends or family.
* Liǎng kuài (两块) - This literally translates to "two pieces," but is often used as a slang way to say goodbye.
Formal:
* Xièxie (谢谢) - This means "thank you," but it can also be used as a polite way to say goodbye, especially after a meeting or conversation.
* Gùnbì (告别) - This means "farewell" and is a more formal way to say goodbye.
Other options:
* Wǒmen xià cì jiàn (我们下次见) - This means "see you next time."
* Hǎo hǎo de (好好的) - This means "take care," and is a more affectionate way to say goodbye.
The best way to say goodbye in Chinese depends on the situation and your relationship with the person you are talking to.