In my opinion the most important thing to become a good trader is to remember this quote 'never invest more than you cannot afford to lose'. Remember this, all the time. Another important point is to have a reliable trading platform, in the cryptocurrency market you can find a lot of scams! Use only well-known and safe exchanges, for example Kraken or CoinDeal. As far as I know, the second one even has a Swiss VQF which is pretty impressive and it is a kind of a proov that it's a safe place to buy.