Today's chinese word of the day is 你好 which means hello.
In mandarin 你好 is pronounced nǐ hǎo.
It literally means "you good?" and is used as a very common greeting.
As with "how are you doing?" in english, nobody really cares if you are good or not, but uses it only as a greeting. So don't take it as a chance to explain your woes or problems to someone.