This is by no means a principle, but here are some of the things (not in order) that I've learned from investing and trading cryptocurrency, stocks, and forex (I didn't do forex anymore) since 2020:
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Setting a goal is a must. I often roundtripped my profit because I didn't have a set of strategies in mind in my early days. Setting where you will take profits and cut losses is an edge.
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Being greedy when everyone else is afraid and afraid when everyone else is greedy is surprisingly applicable in many scenarios.
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Don't compromise on security. Be cautious.
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The market will always find its fair value regardless of how long it takes to do it.
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Having conviction is a good thing, but I often did not have enough fiat when the opportunities came. Keep some buffers, because sitting and waiting is actually a strategy, too.
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Market trend is not just a myth. This will emerge as some kind of intuition when you have enough information.
I'll add more over time.