Learn / Fundamentals

Every number on a stock page, made obvious.

Learn how markets really work, one number at a time. Every lesson is interactive and free. You play with the inputs, break the common misconceptions, and watch the metric move, the way it should have been taught the first time.

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01 Start here

Three lessons, in order

Start with company size, then profit per share, then what you pay for that profit. After that, pick any topic below by question or difficulty.

02 The library

Pick the question you have

Metrics are grouped by what you want to know. Filter by difficulty if you want a shorter path.

9 lessons

Valuation

What am I paying?

How much do I pay for each dollar of profit?

Move price and profit per share

How much yearly cash do I get per dollar I pay?

Watch the seesaw when price moves

What earnings return am I buying at this price?

Flip P/E into a percent return

What is left for owners on the balance sheet?

Stack assets, peel off liabilities

Profitability & returns

Is it a good business?

How much profit belongs to one share?

Issue shares or buy them back

How much of each sales dollar is left after costs?

Peel costs off a dollar bill

How fast are sales growing year over year?

Race two growth rates across years

Risk & size

How risky is it?

How big is the company in dollars?

Price times shares, not price alone

Does this stock move more or less than the whole market?

Play a market drop, see the swing

Ready to see a real stock?

Every lesson ends on a live ticker — ratios, history, and how it compares to its peers.