The common mistakes of the traders are they are too greedy, they aim high even it is not possible. I already regretted many good moments to sell my coins, I should now be rich today if I didn't became a greedy trader.
The most common mistake lies in the emotional factors we have. Sometimes we are too confident and vice versa. Making some targets is what I want to do from now on so that emotional factors won't be the main factor in my trading habits anymore.