Selling while it's red is a bad move. I mostly do that before but now, instead of looking at the market dropping, I drop my phone and go out to relive the stress of seeing my portfolio drop. Recently I have sold half my coins at half of the price it currently is now because of loosing temper and because I thought it will keep droping but I was wrong. It's best to keep coins and hodl them for longterm if you want profit.