Bitcoin is good investment but I wouldn't suggest to put all your money into it. I wouldn't suggest puting all your money into anything, not just Bitcoins. Every investment is a risk and there is always the danger of losing money so you have to invest with care and you always have to have some back up. Don't ever invest more then you can afford to lose.
yes, I agree with you, putting all the money on the investment is very dangerous, because if you suffer losses then the money will be all gone, so better invest some of the money you have, to earn extra money.