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After learning the first, it is important to learn the second else you will be a trader with a strategy that should work, but no profit to show for it. When you hear of traders who were successfully able flip small account sizes to big ones in a short time, it is not just because of their strategy alone, it is also due to understanding of how to maximize profits and minimize loss.
Yeah, this is somehow related to risk management.
I highly suggest utilizing the risk-reward ratio for every trade you do, like sticking to your plan and planning everything before you enter a trade. Mastering this and have good dedication, it's really a big help.