A trading journal is a structured record that preserves what was known before a trade, the rules that applied, what was actually executed, the resulting P&L, and the later review.
How it works
Useful journals separate observable facts from interpretations, written rules from execution, and process quality from the final outcome. Timestamps and rule versions help prevent hindsight from rewriting the original plan.
The journal becomes more valuable across a sample of trades, where repeated execution errors, unstable rules, or ordinary variance can be distinguished more reliably than in a single memorable trade.
Why it matters
A journal converts trading experience into evidence that can be audited instead of relying on memory or stories about why a trade worked.
More detail is not automatically better. A long diary with no entry rule, invalidation, size, fills, or timestamps can still be impossible to review.
A simple market example
‘I knew it would bounce and made 800’ becomes reviewable only after the original setup, risk, entry rule, actual fill, any rule violation, and final result are recorded separately.
Common mistakes
Recording only profit and loss while omitting the plan and execution details.
Rewriting the original thesis after seeing how the market moved.
Frequently asked questions
What should a beginner record?
At minimum: facts, thesis, entry and exit rules, risk, intended size, actual fills, deviations, result, and review.
Should emotions be included?
They can be useful as context, especially when linked to a specific action or rule deviation rather than written as a free-form diary only.
How often should a journal be reviewed?
Review individual trades for execution quality and batches of trades for recurring patterns before changing the strategy.
Educational content only. Definitions describe common market usage and may vary by jurisdiction, instrument, or institution.