AI Prompt That Teaches One Investing Concept Through a Single Holding

What you need

The snapshot template is optional. Without it you get a lesson about the holding; with it, the lesson can also cover how the holding fits the rest of your money, for example single-company concentration. Add these lines:

• Holding: [name and ticker]
• Type of holding: [single share / ETF or fund / coin / currency pair / precious metal]
• Price 12 months ago and today: [two prices]
• Fund details, if a fund: [TER, number of holdings, largest holding and its weight]

The type line steers the choice. Concepts that suit a single share, such as earnings or dividend yield, mean little for gold, and the model should not have to guess which you hold.

For a fund, the details line holds most of the teaching material. TER, the total expense ratio, is the fund's yearly running cost as a percentage of what you hold. The number of holdings and the weight of the largest show how spread out the fund is. All three are on the fund's factsheet, a short document the provider publishes, usually linked from the fund's page on your broker's site.

If you already know a concept well, add "not volatility" or similar to the type line, and the model will pick another.

Here is my financial snapshot. Use only these numbers.

Currency: [e.g. EUR]
Date: [today's date]
Age: [optional]

ASSETS
[name] — [category: cash / stocks / ETFs / crypto / property / metals / other] — [value]
[name] — [category] — [value]
...

LIABILITIES
[name] — [type: mortgage / car loan / credit card / student loan / other] — [outstanding balance] — [interest rate if known]
...

CONTEXT (optional but improves the answer)
Monthly income after tax: [amount]
Monthly spending: [amount]
Amount I add to savings or investments each month: [amount]
Value of the same assets 12 months ago: [amount]

The prompt

Copy this exact text and paste it into ChatGPT, Claude or Gemini directly beneath your snapshot block.

You are an investment teacher. Use this holding to teach me one concept that it
illustrates well.

Holding: [name and ticker]
Type of holding: [share / ETF or fund / coin / currency pair / metal]
Price 12 months ago and today: [prices]
Fund details, if a fund: [TER, number of holdings, largest holding and weight]

1. Start with one to three facts about this holding that make the concept
   relevant. Show any arithmetic.
2. Name exactly one concept, such as volatility versus risk, compounding, market
   cycles, dividend yield, look-through diversification, single-company
   concentration or expense ratio. Define it in one or two plain sentences.
3. Teach it with this holding's figures, including one simple comparison.
4. Explain what it means for the holding's returns, its risk or its fit in a
   portfolio.
5. Give me one check I can repeat whenever I look at this holding.
6. End with a one-sentence takeaway.

One concept only. If a number is missing, ask me for it rather than estimating.
No buy or sell recommendations, price predictions or product picks. This is
educational, not advice.

What good output looks like

The lesson should grow out of the facts, so it starts with them. Say the holding is a global equity ETF with a TER of 0.20%, about 1,400 holdings, the largest at 4.8% of the fund, and a price that went from €96.00 to €104.00 in a year, a rise of 8.3%. A good choice is the expense ratio, because it is the one figure here you can compare directly across funds.

The teaching part should use money, not only percentages. On a €20,000 holding, 0.20% is about €40 a year, taken from the fund's value rather than billed to you; a fund charging 0.60% would take about €120. Then a simple comparison over time: at an invented 6% a year before costs, €20,000 grows to about €35,100 in ten years at 0.20% and about €33,800 at 0.60%, a gap of roughly €1,300 from costs alone.

The check at the end should be one you can repeat, such as reading the TER on the factsheet once a year. For a coin priced in dollars that rose from $40,000 to $52,000, the same prompt would more likely teach volatility, and a good answer would say that two prices cannot measure it. A weak lesson defines three terms, or defines one without using the holding's figures.

What this can't tell you

The model teaches from general knowledge, and its definitions of fund terms can be loose; the provider's own documents are the source to trust. With only two prices it cannot measure volatility. If it picks that concept anyway, ask it to say so, or paste monthly prices.

Lessons about costs leave out what your broker charges, currency conversion fees and tax on dividends or gains in your country, and the model gives no tax advice. A concept explained through one holding can make that holding look typical when it is not. Example growth figures in the lesson are illustrations, not forecasts.

Doing this without the retyping

In Sumio this is one of the 62 built-in prompts, listed as "One Concept for This Asset". It runs on a stock, fund, coin, currency pair or precious metal you already track, with prices that update automatically, so the lesson starts from current figures without lines to fill in. Your records are stored on your device, and running the lesson sends the figures it needs to an AI provider. The AI assistant is included in Premium.