first is patience,
patience is the main key to successful trading, because without patience we will often be stressed when seeing the market go down so fast,
the second is don't panic.
do not panic is the second key to successful trading, because if we often panic then we will also often cut losses,
and learning to control both emotions is the key to success.
I agree. It happened to me once when I panic bought some coins when their prices went low without thinking how much time or the percentage of them gaining back up. I was so excited then, and surely, it can to bite me on my ass, since some of them never really recuperated and some I only sold on break even. I was really frustrated since what I used that time are the returns I earned from a long and much anticipated ICO rewards where I started before. I have yet to learn then to be tactical with my actions, especially in the trading market.