Teach everyone how to distinguish between good coins and bad coins?

It's simple, when Bitcoin crashes, you can see the degree of pullback of other coins, regardless of how much they rose before. If the pullback is significant, it means they also cannot be held for the long term. You must choose valuable coins with strong backing from major investors or ecological support!

Small rise, large pullback, junk

Large rise, large pullback, harvesting leeks

Small rise, small pullback, inferior quality

Large rise, small pullback, high quality

Take a look at which type your coins belong to?