A trading journal is the most underrated tool in investing. It is simply a logbook of all your trades: what you bought, why, when, and how it turned out. It sounds boring, but it is the difference between investors who repeat their mistakes and investors who learn from them.
Why a journal?
Most investors overestimate their good trades and forget their bad ones. After a year of investing, you no longer remember why you took that one trade or what went wrong with the other. Without a journal, you do not build knowledge. You repeat patterns without recognising them.
A journal forces you to be honest with yourself. It exposes where you systematically make mistakes: entering too early, exiting too late, taking positions that are too large, or trading on emotion instead of your plan.
What do you write down?
For every trade you record:
- Date and time of entry and exit
- Instrument: which stock, ETF or crypto
- Direction: long or short
- Entry price and the reason why you entered at that exact moment
- Stop-loss and profit target determined in advance
- Position size and the percentage of your capital that you risked
- The setup: what signals were there? What technical or fundamental arguments?
- Result: profit or loss, both in euros and in percentage
- What you felt: were you confident, anxious, eager, hesitant?
- What you would change: looking back, would you take the same trade again?
The emotional component
The most valuable information in a journal is not the price or the result. It is your emotions. Over time you discover patterns:
- Do you take larger positions after a winning streak? That is greed.
- Do you skip setups after a loss? That is fear.
- Do you move your stop-loss because you "just know" it will work out? That is hope, not analysis.
- Do you take trades that are not in your plan because you are afraid of missing out? That is FOMO.
The more algorithmically you think about the investment process, the less emotion you bring into it, and the better you perform. A journal is the first step towards that disciplined approach.
Evaluating
Keeping a journal is only half the work. The other half is evaluating periodically. Schedule at least once a month a moment to read through and analyse your journal:
- Which setups yielded the most?
- Which setups lost the most often?
- Did you stick to your plan, or did you deviate?
- Was your position size consistent with your risk management?
- Are there situations where you consistently make the wrong decision?
Based on this analysis, you adjust your plan. Not based on feeling, but based on data. Your own data.
How to keep track?
The medium does not matter. Use whatever works for you:
- A spreadsheet (Excel or Google Sheets) is the most flexible and lets you filter and sort later
- A notebook works if you prefer writing by hand
- Specialised apps like Edgewonk or TraderVue offer extra analysis features
The most important thing is that you do it, consistently and honestly. A journal that you only fill in after profitable trades has no value. It is precisely the losing trades that contain the lessons.
The secret
Ask a professional trader what sets them apart from an amateur, and the answer is rarely "a better indicator" or "more knowledge". It is discipline, self-awareness and the ability to not repeat mistakes. A trading journal is the tool that develops all three.
You do not have to do everything perfectly. You just have to make the same mistake a little less often each month. Over time, that is the difference between an investor who makes it and one who gives up.