One way you can work out how strong a coin is on either extreme green days or extreme red days (Volatility).
Monitor which coins perform the best on both days.
So if we see a massive pump in the market, search which coins are consistently being the strong performers in the market.
You can also do the exact same on a red day when the market has a major dip during some of these major corrections.
You can start to take notes which coins hold up the best and recover the quickest.