3 ) Never Go for Revenge Trading : I have seen many times that when Even a Small loss happens, many of us will just go with double Amount in next trade just because we can't accept loss & wanted to recover that with injecting double Amount ! It's really Silly Boys !! How you can be sure that your that trade will go on perfect way 100% 
I once was proud with betting like this in the past.
I thought that it is a good idea to try Martingale in investing or trading but most of them led to my bad trades and investments. It is really hard to adjust in this market at first but when you are used to it, even losses are just a norm. I keep on saying this to some of the people that ask me about investing and trading cryptocurrency, keep on reading. Knowledge is power.