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A trading journal is a log of every trade you take, along with the reasoning behind it — the setup, the entry and exit price, the size, the result, and a short note on what you were thinking at the time. On its own, taking hundreds of trades doesn't guarantee getting better at trading; without a record to review, the same mistakes are easy to repeat without ever noticing the pattern.
The most useful part of a journal usually isn't the profit-and-loss column — it's the notes. Entries like "took this early, didn't wait for confirmation" or "moved my stop because I didn't want to be wrong" reveal behavioral patterns that a bare list of numbers hides. Reviewing a month of these notes together often exposes one or two recurring habits that are costing more than any single bad trade.
A minimal journal only needs a handful of fields to be useful: date, instrument, setup/reason for entry, entry price, stop-loss, take-profit, exit price, and a one-line note on execution — did you follow your plan exactly, or deviate, and why. Screenshots of the chart at entry are optional but make later review far more concrete than numbers alone.
The habit pays off most at the weekly and monthly review, not in the moment of trading. Set aside time to read back through the week's entries and look specifically for repeated mistakes — oversized positions, early exits, entries outside your plan — rather than just totaling the profit and loss. That review is where a string of individual trades becomes an actual skill.
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