Learn investing, properly
Three tracks, from total beginner to the science behind the numbers. Everything is in plain English, and every deeper lesson is grounded in real research you can check. Education and learning only — not investment advice.
New here? Start with these
Beginner
The whole picture in plain English — what investing is, what you own, and the safety numbers that keep you on plan.
13 lessonsGoing deeperIntermediate
The ideas behind the numbers — correlation, the efficient frontier, beta, factors, fees — still in plain English, now with the research behind them.
14 lessonsThe scienceAdvanced
How the pros actually build and stress portfolios — optimisation, fat tails, behavioural finance, and position sizing — explained simply, cited properly.
20 lessonsBrowse by topic
The basics
What is investing?
BeginnerInvesting means putting your money to work so it can grow over time.
Risk and reward
BeginnerBigger possible rewards almost always come with bigger ups and downs.
Your time horizon
BeginnerHow long until you need the money decides how much risk makes sense.
Don’t put all your eggs in one basket
BeginnerSpreading your money across different things makes the ride smoother.
Where do these numbers come from?
BeginnerEvery price and stat is built from trusted, public market data — here’s who provides it.
Your portfolio
What’s in a portfolio?
BeginnerA portfolio is just the collection of things you own, plus any cash.
Build your first portfolio
BeginnerFinisdom can turn your goals into a smart starter mix in a few clicks.
Staying on plan (drift & rebalancing)
BeginnerOver time your mix drifts off target; rebalancing nudges it back.
The quiet bonus of rebalancing
IntermediatePeriodically trimming winners and topping up laggards can add return and control risk.
The quiet tax of fees
IntermediateSmall yearly fees compound into a huge bite over a lifetime of investing.
Credit spreads and bond ETFs
IntermediateThe extra yield a bond pays over a “safe” government bond is the market’s price on risk.
The safety numbers
How bumpy is it? (volatility & drawdown)
BeginnerTwo numbers tell you how rough the ride is and how deep the worst drop was.
Is the bumpiness worth it? (Sharpe)
BeginnerThe Sharpe ratio scores how much reward you got for the bumpiness you took.
Compounding: how money snowballs
IntermediateGrowth on top of past growth is what makes long-term investing powerful.
What “risk” really measures
IntermediateIn finance, risk usually means how much returns bounce around — the size of the swings.
Why diversification actually works
IntermediateWhen your holdings don’t move in lockstep, their swings partly cancel out.
Drawdowns, recovery, and timing
IntermediateA drop hurts twice: the loss itself, and the steeper climb needed to get back.
Reward per unit of risk
IntermediateSmart scoring compares how much reward you earned for the bumpiness you took.
Fat tails and black swans
AdvancedReal markets have far more extreme days than a tidy bell curve predicts.
Value at risk (and its blind spot)
AdvancedA common gauge of “how bad is a bad day” — useful, but it hides the very worst.
The theory
The efficient frontier
IntermediateFor every level of risk there’s a best-possible mix — and together they form a curve.
Beta and the price of risk
IntermediateBeta measures how much a holding tends to move with the whole market.
Alpha vs beta
IntermediateBeta is the return you get just for riding the market; alpha is the extra from skill.
Factors: the ingredients of returns
IntermediateBeyond the market, a few traits — like value and momentum — have paid extra over time.
When the optimizer fools you
AdvancedMath that finds the “best” mix can backfire, because it trusts shaky estimates too much.
Blending the market with your views
AdvancedA smarter starting point: begin with the whole market, then nudge it with your opinions.
Risk parity: balance the risk, not the cash
AdvancedInstead of equal dollars, give each holding an equal share of the portfolio’s risk.
Why stocks pay more (the risk premium)
AdvancedOver the long run, stocks have rewarded their stomach-churning ride with extra return.
How much to bet: the Kelly idea
AdvancedThere’s a math-optimal bet size for growth — and most pros deliberately bet less.
What makes a business worth owning
AdvancedGreat long-term returns come from durable, high-quality businesses — and judging that takes more than a number.
What a factor genome is (and why 9 holdings can be 2 bets)
AdvancedCounting your holdings tells you almost nothing about how diversified you are — counting your independent exposures does.
Behaviour & markets
Drip it in, or all at once?
IntermediateInvesting a lump sum usually wins on average, but spreading it in can feel safer.
Your brain vs your portfolio
AdvancedWe feel losses far more than equal gains — and that warps the choices we make.
Are markets efficient?
AdvancedPrices reflect a lot of what’s known — but maybe not everything, and not always calmly.
The market’s mood
Reading the market’s mood (Macro)
BeginnerA few big-picture gauges tell you if markets are calm or nervous.
Calm and stormy market moods
AdvancedMarkets switch between long calm stretches and sudden stormy ones — and fear has a price.
Reading prediction markets
AdvancedA prediction-market price is a real-money bet turned into a probability — useful, but not gospel.
Cross-asset signals
AdvancedMarkets are linked, so when two that normally move together pull apart, the gap itself is worth reading.
Earnings surprises and drift
AdvancedWhen results land far from what the business did a year ago, the price often keeps moving that way for weeks.
Reading 13F filings
IntermediateBig investors must disclose what they own every quarter — but the list arrives late and shows only half the picture.
The tools
Reading a price chart (Charts)
BeginnerA candlestick chart shows where a price opened, closed, and how far it swung.
The tools at a glance
BeginnerA quick tour of what each part of the app is for.
How backtests lie
AdvancedA strategy that looks perfect on past data often falls apart in the real world.
Proving an edge is real (out-of-sample testing)
AdvancedThe only honest test of a strategy is how it does on data you didn’t use to build it.
Putting the science together
AdvancedThe big ideas combine into one calm plan: diversify, manage risk, cut costs, and stay disciplined.
Why backtests decay after publication
AdvancedA strategy that looked excellent on the data it was chosen from usually gives back much of that edge the moment it has to earn it forward.
What makes a track record believable
AdvancedA record only means something if the rule was fixed before the record started, and the failures are still on the list.
Investing glossary
Every term you’ll meet, defined in one plain-English sentence.
