Certainly nothing is better than learning with others mistakes, and why is that? Just because it is the most cheap way of learning, when in the market, it will not be so complacent and very expensive. A lesson that is very neglected is the one which Jesse Livermore say: "Profits always take care of themselves but losses never do".
Or, in a concise form: stop loss. Never forget to use it and not just as a fun tool, but it ought to be part major strategy, to your risk management. If you don't have one yet, build one, no time for losing on this.
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