For me the best way to understand and improve trading are based on your experience, Trading is just like a game if you have so much experience you will learn from your mistakes, As you see most of the professional traders have more than experience than non-pro and not all of them are not experienced to losed some of their investments and Reading guides and techniques are good too to improve your trading skills and analyzing.
Just keep on learning don't give up you're not a good trader if you didn't experienced to lose