A good way to minimize the risks is not invest real money (or invest a little amount).
With some efforts you can earn bitcoin from faucets, forum signature campaigns, glambling (not recomended), trades, etc...
After achieve a good bitcoins amount you could invest It. If you lose all, you don't lose your money.
faucets pay literally nothing. You will make 5 cents per hour if your lucky lol
He also mentioned that some efforts can earn money from gambling and trades as well but without using our money and only with efforts how can one earn money from these methods?
Instead of going with faucets, you can try signature campaign then you will earn some decent amount per week and then you can use that money for trading to earn more.
But never use gambling for earning money. If you want some entertainment then only go to gambling.
Gambling are not about for earning some of the decent amount but it's more like the doubling way, or for some people are calling that the way of fun. at the first gambling, it's not be providing for earning a decent amount but for the people are wanna for spending their money to playing with them.