If we are to discuss about altcoins effectively, we should first list out the most successful and begin from there.
It is unadvised for newbies to start investing in altcoins when they have little knowledge of cryptocurrencies or how the market for trading and payments transaction is.

Altcoins have the potential to double ones investment but can also reduce it to zeros when the market volatilities hit or for some other wack reasons, that's why BTC is the most advised investment, although it is more expensive to purchase, it is a great choice when considering DCA strategy of investment.