For INVESTING ala Warren Buffet read any Benjamin Graham. All classics- the balance sheet- long term undervalued approach. Warren Buffet was his pupil. Hard to argue with a billionaire.
I made very good money for clients and myself with Peter Lynch's books. (26% IRR) The former manager of the Magellan Fund.
For day trading: The classic " Reminisces of a stock operator" 1923 Jesse Livermore. Herd mentality, reading the tape, human nature- very wealthy trader.
Use PLAY money!!!!!!!! At first.
I have an old office mate from Merril Lynch. He is Mensa, & has 2 PHDs makes 6+ figures a year day trading 10 hrs a day in his pajamas. He STILL gets his ASS kicked every couple of years and calls me almost suicidal. Day trading is not easy. Please be careful..... you are betting against pros- some governments- WTBTS types- off-shore scammers and 3rd world governments who do insider trading daily.. Remember ANY information you have access to is OLD and possibly BS.
Learn puts, stops and spreads.
Getting a second job and putting all that money into ETFs and an Index IRA is a LOT less work.