Money & investing · course 68 of 105
Stock Market Investing From the Ground Up
Learn the language and the maths of investing: the key words, returns, compounding and the rule of 72, P/E, dividends, and what fees cost you over 20 years. Never what to buy.
Not on sale yet. When sales open: $4.99 USD for this course, paid once, or every course for $9.99 USD a month. Prices
$4.99 USD, paid once. Or every course for $9.99 USD a month until you cancel; try it free for 7 days first (email only, no card, ends on its own). Tax added at checkout where it applies.
Runs in Claude (claude.ai, the Claude apps or Claude Code) with your own Claude account. A course opens there as soon as your payment goes through; nothing is shipped.
Preview
What it teaches
What the basic investing words mean (stock, dividend, capital gain, index fund, expense ratio, load, market vs limit order, bid/ask/spread, diversification, rebalancing, dollar-cost averaging, bull and bear markets), and the maths behind them: total return, compound growth and the rule of 72, why a 50% loss needs a 100% gain, EPS, P/E, market cap, dividend yield, what fees cost over 20 years, average cost when you invest monthly, and how to rebalance. The AI asks 3 questions, places you, shows a short card per module, then gives you one question at a time and checks your number against keys computed by script, naming the mistake when it’s a common one (“you divided by the selling price, not what you paid”).
No advice. It never tells you what to buy, sell or hold. It teaches you to read the numbers.
How long
55 items. About 45-60 rounds plus a 12-item final: 3-4 sessions of 15-20 rounds (estimate, not timed with a real student). The tutor gives a one-line save code at the end of each session.
The modules
4 modules, drilled one item at a time.
- M0
The words
Concept questions
- M1
Returns and growth
Maths
- M2
Prices, earnings and yield
Maths
- M3
Funds, fees, averaging and orders
Maths
Before it teaches, it asks
- 1What brings you here: a first brokerage account, a work retirement plan, a class, or curiosity? Have you bought a stock or fund before?AI voice (ElevenLabs)
- 2The stock trades at $40 and EPS is $2.50. What’s the P/E ratio (1 decimal)?
- 3A stock falls 50%. What percent gain does it need to get back to where it started?
What’s exact, and what isn’t
Show
Straight from the course’s own notes.
- Computed by script
- Every maths key. 28 of the listed wrong answers come with the mistake that produces them, and the script runs each mistake to prove it really gives that answer; the rest (yes/no and choice traps) are checked to differ from the key.
- Sourced
- Definitions from the SEC’s Investor.gov glossary and pages (US government), 29 quotes matched word for word against the pages on 2026-10-09; dividend yield from Wikipedia (dated).
- Simplified on purpose (said in the items)
- Fee drag uses “return minus expense ratio”; yearly compounding unless the item says otherwise.
- Not in it yet
- Taxes, retirement accounts, bonds beyond current yield, options (see the Options Basics course), crypto, reading a real company’s annual report (see the Reading Financial Statements course).