Don't fall in love with a coin, has probably been best advice i have heard. That means that if you have strong emotional bond with your bag when it's going up, you don't see what's happening, because you stay convinced that it's the next ETH or something.

That means when bad news come, you will brush it off as a fud and you don't see clearly what's happening. You are delusional and in denial to the -99% drop. When you don't have strong bond with your bags, they are easy to sell in profit without looking bag. And when you sell, sell slowly and never sell everything, because there's a tiniest change that bag will moon in the future, and you might want to have bag that you forgot even existed. That once happened to me with one coin that's already dead by now.