You need to study and read a lot. In the beginners section you can find thread that will help you out understanding things in this forum and on bitcoin.
The most common form of investing in Bitcoin is buying the currency in hopes it will appreciate in value.Dont take anyones advice about what will happen with the currency, do your homework, learn about Bitcoin to come to a conclusion. Personally I believe we are just starting, but thats my own opinion and you shouldnt consider that as investment advice as well.
Never invest more than you are willing/able to lose Bitcoin is a very risky investment and you should keep in that in mind at all times.
