Last 2 days I bought for about some cheap coins and it went down for about 5% or something and I decided to sell. And now, I am at full regret that all of those coins are now up for about 20%. My lesson for that is to be patient since the market was down for some day and it will always go back up.
At least you've learned the lesson that you should wait and don't sell whenever you are still at loss. That's not the best decision that you can make if you are not gaining after buying that coin. What's the reason why you are even trading if you are going to sell at loss? You better not buy or don't trust any of the coins if you will have this mindset. And I'm sure now that you've learned a lot from that mistake, we are all going through with the same experience and it's the best teacher.