Well, if for example you have 1000, then buy 15-20 percent now the cryptocurrency that you like , I would advise the top 20, then the coins are very strong and are unlikely to give you a minus in the future
Why invest 15-20% of $1000 in cryptocurrencies if TS wants to invest the whole amount? And to advise to invest in the top 20 coins is not very useful. It would be better if you offered some specific coins rather than general phrases.