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.
A very good recommendations, but I would not recommend cloud mining investment because of scammers'. I personally we recommend op to rise it's capital through rendering of services in this forum and other sites that offer little services for bitcoin, than invest the earned into margin trade.