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.
- Litecoin used to be a Top 5 coin. It's not in the 13th place.
- Steller is slowly dropping out of Top 20.
- Monero and EOS have already dropped out.
- I remember that NEO was in the Top 10 a few years ago. It's sitting on #41 today.
- Iota, Dash, DigiByte, Verge have it even worse.