Did I give my friend the right advice?
I appreciated your comments and directions that are given. Although anyone has right for dissenting point of view and reservations that how I can invest. You should also told him that "do you own research'' because Bitcoin will give him guaranteed profit and he should manage risk also so that he does not get the wrong guide.
Whenever i told any new friend about btc then first i told him the the interestes history of BTC start and other information that Bitcoin transactions are verified by network nodes through cryptography and recorded. Bitcoin trading offers several potential advantages, often referred to as "plus points." Its value is highly volatile, meaning that it can fluctuate rapidly in short periods of time. This is due to a variety of factors such as market demand, supply, and regulatory changes. Its high profit potential, liquidity, security and variety make it unique amongst the other networks but the same time it's price can go down if any uncertain happen or any bad news comes in market so that he doesn't invest other than he afford to lose.