I heard people buying bitcoin using real money..
Bitcoin is real money.
I think what you meant to say is that you heard about people exchanging their local currency for bitcoin.
Is it really good since we all know that everything on internet can be hack or something....
If you are concerned about hacking, then you should keep your bitcoin wallet offline.
If you are going to hold bitcoins, it is up to you to secure your money. You should take the time to learn how to properly secure your wallet, and learn what options are available to you to improve security. You should be careful not to install anything that might have malware hidden in it.
Is bit[Suspicious link removed]d to make your money grow fast or will you just lose all those money??
There is no magical way to make money grow fast. Anytime you see anything that says that it will get you lots of money very fast, it is ALWAYS a scam that will take your money (and make lots of money very fast for the person that is stealing from you).