Actually people's learn from mistake. Those mistake I did began, I am realizing now. That's why I want to share it. Perhaps everyone will not agree with me. Every traders have few favorite coins. It's normal fact, but don't love too much any coin it's my logic.
I don't want to mention but I have lost many btc just one coin. Just think it will go more up and didn't sold. In a result price dropped 4X. So I want to say don't love any coin, just sale when you are in profit and go another coin or wait for drop price again and buy it. It's very difficult to recover once drop an Altcoin. One more thing, don't invest your all fund on single coin. It will loss more, who know it will up or drop.
I do not regret the actions that I did, there are few altcoins in my portfolio that loses 90% of its value but I have also altcoins that are really valuable to hold. I realized that not all of altcoins are good for investment and that's why I using the information that I got from my past mistakes to avoid losses.