I think the danger is ICO and some new altcoins, but you don't have to worry too much, just need to enter at a good time.
It not rick. You know what time to invest. So before invest check the price list in the market place. This information help for time to invest and time to complete the process. It any time to change the price. So follow the price list day by day. So people will be learn the crypto. Then people easy to use. It any time to up and down. So this information help time to invest. So price will be go down that time invest. It any time to high the price. That time sell it.
If plan to work it not risk. So check the price list then make a plan. Then easy to get the profit and easy to handle the crypto.