and it's better to choose coins from top 10 for the majority of your portfolio and from top 20 as a smaller part.
Even that can be dangerous if we look back what coins were in the TOP 10/20 just a few years ago and where they are now.
Of course it's dangerous, it's extremely dangerous in fact. I didn't say that it's safe and foolproof way to make money. But compared to investing in obscure shitcoins, it's safer, because shitcoins from top-1000 and below are even more riskier and have very short lifespans and could crash to nearly zero in a few hours. Which is why I want to stress for newbies again that investing in Bitcoin is both simpler and more profitable. If you chase those stupid x100 pumpcoins, you will get broke from all the dumps, but by holding Bitcoin you will make decent gains in a few years without any effort.