There are two main schools for investing/stock trading. "Value investing" which is trying to buy company stocks that are undervalued and generally seeks to hold these stocks for a long time, and "technical analysis" which is focused more on predicting future stock price moves based on reading charts and is focused more on short time frame. Value investing is a more well-respected style but people have made enormous amounts of money from both. If you're interested in value investing I would just read everything warren buffett and charlie munger have ever created. For technical analysis I would just google it and explore and watch out for BS. Investopedia is a great beginner's resource for both.