What are the benefits of using bitcointalk?
Bitcointalk has a repertoire of information related to Bitcoin, it's origin, technology, the economics behind it and also topics on the crypto world in general.
You have access to all of these information if you can access the forum as a guest or a user. The benefit of being a guest is that you got to ask questions and get answers to your specific inquiry.
Is this only for Bitcoin investment persons only?
No, it's for anyone interested in talking about Bitcoin with strangers.
As I know bitcoin and Digital currency are the Future. So how do I invest in Bitcoin and how to earn from it?
The simple way is to buy, hodl and wait for it to rise against fiat. You can also invest in a Bitcoin business like a Bitcoin ATM or wallet service. Bitcoin mining and trading are also ways to earn.