Its always super risky. It sounds like you made some decent gains from your amazon investment though. Its tough though and I would never recommend day trading to anyone who doesn't mind loosing more than they gain. The reliable money is made in longer term investments where you benefit from the dividend yields. Of course for that to be of any real benefit you have to have several hundered thousand invested.
A lot of it is down to luck in the end too. One of the funds I first invested into was an index fund based on the uranium business (primarily for nuclear power plants etc) .. In the end it was worth 10% of what I originally invested. you live you learn.
RE: New Coin Offering, New Scam - Bunny Token