Investing btc is a very good decesion because your money will multiple.To the traders it is benificial to them to invest money.its the fastest way of a trading transactoin now.
He asked something else if you care to reach the actual topic and not just the heading of it.
We all know investment in bitcoins is a good choice but that is very risky too and he wants to know how to avoid that risk, I personally feel the same but then there is no solution too and if there are no price changes then there would be no fun too. Its like friction, necessary evil.