Hello gao
Welcome to the forum. You can learn a lot from this forum.
If you want to know anything just ask. There are different topics on here, if you want to ask about about anything to do with classical music, just go to the classical music forum. Then you can start a new thread there, to ask your question. Have a look round this site and you will see.
This is a very friendly place, so do join in and ask any questions you like.
Margaret