Broad topic 
Trader needs patience and knowledge about cryptocurrencies, that's the most important.
Another thing is to have right exchange, safety first. I can recommend Kraken or CoinDeal.
Trader need to remember not to invest more than he can afford to lose!
This is the first thing a trader must have, we need to control our emotion since it plays a big role in trading , our emotion really affects the way we trade, do some research in every coin that we are investing so that we may have an idea if the coin is having a good way run or it will be a some shit coin in our wallet in the future. Trader needs patience and knowledge about cryptocurrencies, that's the most important.
Another thing is to have right exchange, safety first. I can recommend Kraken or CoinDeal.
Trader need to remember not to invest more than he can afford to lose!