Since issued Bitcoin, lot of Altcoins all came out, and there have been some brilliant performance but they are just a flash in the end, because there are too many bubbles, which has caused many people who have invested in virtual currencies to experience great ups and downs. We can analysis the direction of some cryptocurrencies. Do some speculation and analysis to reduce its risk. However, there is no way to make cryptocurrencies stable and profitable.

But it's not a problem for long term investors because these timely ups and downs doesn't matter when you have invested for a long time. For example BTC is currently showing ups and downs in the market but the long term investors will hold it for long enough to benefit them.

All currencies will rise and fall every time. Buying a high price at a low price is a rule of investment.
Before starting to invest in any cryptocurrency read and study about cryptocurrencies. In any case, do not invest more than you are willing to lose.