Just read some article or short youtube video and try it on a demo account.
You'd have better understanding when you're executing the theory itself directly into the trading platform than just seeing some videos or reading some books.
At the end of the day, you're the one that need to tailor a good strategy to make profit. Those books are just textbook guide that won't always right in current market with so many variables.
Let us put it this way, we can read all the textbooks that we want or watch videos all day long, but the actual experience is still different. Hence, once you acquire some knowledge, try to deploy it in actual trading. Do remember, use small amount of money first.