What's the best way to learn about stock trading strategies?

First learn Technical Analysis from any Expert specifically from any Professional Trader. Along with this read books on “Trading Psychology”. After the completion of course, make your own “Trading Setup” (define which market you like to trade, which scripts you follow, which type of Trading you prefer (Day/Swing/Long Term), what’s your risk management plan). Take help of your Trainer to define the setup. Do back test on past data and check the accuracy of your setup, if it works well (getting 65% and more accuracy) then follow the same with real money. Whatever trade you take keep records of them and tally what can we do best to get more profit (if trade goes in our favor) and how can we minimize the loss (if trade goes against us). With time, with this way of improvisation one become successful Trader.