谢谢 (xiè xie)
This is a very versatile phrase that can be used in almost any situation.
There are also other ways to say "Thank you" in Chinese, depending on the context:
* 感谢 (gǎn xiè) - More formal and often used in writing or speeches.
* 谢谢你了 (xiè xie ni le) - More casual and can be used with friends or family.
* 多谢 (duō xiè) - A slightly more polite way to say "Thank you".
* 太感谢你了 (tài gǎn xiè ni le) - A very heartfelt and sincere way to say "Thank you."
The best way to choose the right phrase is to consider the formality of the situation and your relationship with the person you are speaking to.