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.
I think this tips of advice is the best thing for me that I can consider which is very safe and have a big point into it. In fact, we can really earn bitcoin without getting money into our pocket just all we have to do as a newbie start in faucets for us to have free bitcoin and join the signature campaign and lastly do the trade if your want earn fast bitcoin but very secured.