With a certain amount of capital, I should invest in famous virtual currencies like btc, eth ... less volatile or new virtual currencies with little capital that can make huge profits but with high risks?
Can you give me suggestions?
To be honest with you, asking financial advise here is very bad. Why? Because everyone here will shill for their favourite coins. But I will say that majority here have their investments on bitcoin, probably like 50%-60% of their portfolio and the rest on the rest of altcoins.
However, you still have to do your own research (DYOR), and that is the first step of being a successful crypto investors. Don't rely on others, you should do your homework, so best of luck to you and I do hope that you are here for long term and not just think of crypto as a way to get rich quick.