you are correct learning how to trade is an endless knowledge. here are some key points why you should constantly learn from all of your trades
1. the market always changes as time goes by different market players enters into the world of trading
2. new generation of traders are being developed
3. different kind of strategies are improving as well

for me if you can afford to pay a person who can guide you who had experienced the market better than you.
in this way you can sync in the previous data that he collected.

A better way to illustrate this one is that before you can use bitcore wallet you need to download those previous data
in order to use the wallet.

I Hope this helps