How to say "Thanks" in Chinese

There are a lot of ways to say "Thank you" in Chinese, but all in all they usually can be expressed by a single word “谢谢” meaning "Thank you". Here are some examples:
谢谢 － Thanks
谢谢您 - Thank you (addressing to an older person, showing respect)
多谢 - Thank you very much
谢谢大家 - Thank you (addressing to several people)
太谢谢您了 - Thanks a lot

When you ask a person for a favour or to help you with something, you can use the following expressions:
辛苦了 (xīnkǔle) - means "I've bothered you so much"
打扰了 (dǎrǎole) - "Sorry for bothering"
让您费心了 (ràng nín fèixīnle) - "May I trouble you?"
给您添麻烦了 (gěi nín tiān máfanle) - "I gave you not a little trouble"

让您受累了 (ràng nín shòulěile) - "Sorry for having put you into trouble"
劳驾了 (láojiàle) - "Excuse me, may I trouble you?"

When other people say "Thank you" to you, there are also several ways to react to their words “不用谢”， “不谢”， “不客气”，“没什么”，“没事儿”，“没关系”，“不辛苦”. All of these words mean "There is no need to say thank you". Here are some examples of commonly used phrases:
你太客气了 - You are too polite.
哪里，很愿意为您效劳 - Don't thank me, I did it with pleasure.
一点小事，用不着谢 - It's not a big trouble, you don't need to thank me.
谢什么呀，大家都是朋友 - Don't thank me, we'are friends (meaning "friends must help each other")
这是我应该做的 - This is what I must do, so don;t thank me.