1. Learn to trade with just one strategy
This is one of my common mistakes that I didn't make because I was moving from one trading strategy to another and looking for the holy grail. A magical trading strategy and indicator that will give me guaranteed profit. And the tendency is that we will try many trading strategies that we can find on the internet that are new indicators that are profitable, and if they are not profitable, we will look for something new.
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I agree with this because, even if you have a lot of strategies that do not make you profitable, they are useless. Better to have 1 that you master and you really know how it works, because I believe in quality over quantity.
Another thing is I am not a fan of multiple trading indicators in your chart that sometimes it is already redundant you are not really using or maximizing it, it just a mess on your chart.
In as much as I will agree with you that it is good to trade with one strategy, it is not totally bad to learn more than one strategy. It doesn't mean that you will apply all the strategies you know at the same time in the market. As me and you know, the market is too dynamic. We could be taking unaware and within a twinkle of an eye our strategy is rendered useless. If this happens, where will you run to. So, it is needed that we should have a backup strategy to keep going. Master one strategy as the main, but then, have plan B strategy.