To add and expand to
@deaddog post above...
- Books of the top of my head (Market Wizards Series and recommendations of books by Traders interviewed, Reminiscences of a Stock Operator)
- Internet (ET, Futures IO and Reddit (mainly to understand the psychology of crowd))
- Experience - paper trading is fine but for most people trading real money is different. Your emotions will respond differently when "real" money is on line. Trade small until you know "yourself" and how you react to stress (both greed and fear).
- Common Sense - still working on it however my motto is that a smart person learns from their failure, a wise person learns from other peoples failure.
Main learning from years of investing and trading - its not about accounting, finance, systems or economics etc. Its about developing a worldview and then developing the confidence and conviction to act on that worldview. There are no right or wrong answers. Every trade has two sides. Your worldview will dictate which side you take. If you are frequently wrong, go thru 1 to 4 above, rinse and repeat. Worldviews are not static. It should evolve with new information and your personal experience in the market. As one of the traders interviewed by Schwager said "strong opinions, weakly held."