Right now i am planning to buy btc approx 3-4 btc and just hold them as i guess the price of bitcoin will increase in future and i will get some good profit.But i want to know what is the risk involved.Can bitcoin price decrease and is this right time to buy the bitcoin.
Depends on how long you intend to hold it. If you intend to hold it for the long-term, it shouldn't have too much risk. the price will go up and down, but will probably be in an upward trend in the next few years.
I agree with you, any form of business that is done and hope to get a profit certainly has a risk either real business or online business. And is a business risk if in pact we must get a loss or profit. My advice if you do not have Beliefs about investing in bitcoin, it would be better to look for other investments that have better progress than bitcoin