The trading strategy
After choosing the investment horizon, you have to find a trading technique tailored to your personality and your skills. For example, some investors like buying on a medium and selling on a resistance. Others prefer to buy or sell breaks or they use technical indicators such as moving averages.
Then you need to backtest the trading method to see if it runs on historical market data. With a system that earns more than 50% of trades, you will have an advantage by using a return-to-risk ratio greater than 1: 1. Past results are not a guide to future performance, but if your test shows that your profits are greater than the losses, the strategy will probably be effective.