For me the most regretful thing that happens to me here in cryptocurrency is when i didnt sell my ebtc(airdrop) when it's price is still very high..Even now though it comes to my mind that.. why i didnt sell a free airdrop coin..It's a free money..Why Why Why?!.. By the way im still beginner in that time and had nothing knowledge about techniques in selling or holding a coin Hahaha