I really think this step is very important but something that a lot of traders does not do - because it is difficult to do in Google Sheets or Excel.
Yeah, there are lots of people joining trading everyday and there are also so many people who are quitting because they don’t get a thing about trading, it’s a difficult thing for anyone to do. But, it’s always good that you revisit your trade history and check the mistakes you have made, this will help you to know what and where to take corrections so that you won’t be repeating that same mistake over and over again, instead you will realize the best way to handle it and place better trades and make profit.
It’s all with time, it’s not something you will learn immediately. And about having a strategy that one can use for trading, a lot of people have mentioned this here a lot of times.