Where else to learn this

A reference that never points anywhere else is a reference that thinks it is complete. This one is not: it explains mechanisms, and there are questions it cannot answer — what a particular contract says, what a supervisor decided last month, what the arithmetic looks like at book length.

Start with the documents, because they are free and they are the source

The method this whole site is built on is reading the document rather than the commentary about it, and almost every document worth reading here is published by an institution that gives it away. This is where a serious reader gets further, and it costs nothing.

• A central bank's own statement and minutes. The decision, the reasoning and the vote, in the institution's own words — and the gap between the statement and the minutes is where the disagreement is. Reading a central bank statement is the playbook; the announcements page lists what has actually been published.
• A supervisor's technical standards and guidance. Long, dry, and the only place the rule is stated rather than described. When this site says "statutory", this is the class of document it means.
• A standard-setter's consultation papers. The most under-read documents in finance: a consultation states the problem, the options and the objections, which is a better explanation of why a rule exists than any summary of the rule.
• An issuer's own prospectus, and its supplements. Free, public, and the thing that actually decides — which document governs is the general argument and the playbook is how to get through one.
• An annual report, including the notes. Every listed company publishes one and almost nobody reads past the front. The playbook says which parts repay the time.
• The statute itself. Harder than any of the above and occasionally the only way to settle a question. It is also the one source that cannot be out of date about itself.

What a book gives you that a website does not

This is not a list of titles — a ranking of books is somebody's opinion, and this site does not publish those. It is what each kind of book is for, so a reader can go and choose one:

• A derivatives textbook gives you the derivations. Every pricing page here states a formula and says what it assumes; a textbook shows where it comes from, which is what you need before you can tell which assumption has just failed. Model risk is the reason that matters.
• A fixed-income textbook gives you the conventions in their full ugliness — day counts, settlement, accrual, the four ways a yield can be quoted. This site covers the conventions that recur; a bond book covers the ones that do not.
• An accounting text or the standards themselves give you the rule rather than the mechanism. How a position hits the books explains what the three measurements do; which one applies to a particular holding is a question with a written answer somewhere else.
• A market history gives you the thing no framework can: how long a wrong belief can last, and what it felt like from inside. The case studies here are deliberately short and mechanism-first, which is the opposite trade.
• A statistics or econometrics text is the one most people skip and most need. Reading a market number is a page; the underlying subject is a term.

The tools worth learning, and in what order

• A spreadsheet, properly. Not as a calculator — as a place to lay out a cash flow, a schedule and a sensitivity, so somebody else can check it. More finance is done here than anywhere, and doing it legibly is most of the skill.
• A programming environment, once the spreadsheet stops fitting. The point at which a model has to be run a thousand times, or read by somebody in a year, is the point at which a sheet becomes the wrong container.
• A data source, last. A terminal or a data subscription is expensive and answers questions you can only ask once you know what to ask. Almost everything on this site can be followed without one, which is deliberate.
• And the arithmetic in your head, which needs nothing at all — the twelve rules of thumb and a drill that generates a fresh round every time.

What is refused here, and why the answer is written into the build

One category of link is not accepted at any price: anything a reader could open an account with. A broker, a trading platform, a contract-for-difference provider, a copy-trading service, a robo-adviser.

• Because a commission on a signup is a payment for producing a customer, and that is the exact shape of the recommendation this site's second rule forbids. The label above the link would not change what the link is.
• Because in the EU it is plausibly a regulated financial promotion, which is not a thing an education site should be doing by accident.
• And because the argument for an exception will always be available. Somebody will one day point out that a particular platform is reputable and the commission is large. The answer never changes, so it is written into the build rather than into somebody's memory: a link whose label or address contains one of those words fails the build, before anybody has to be persuaded.

Programmatic advertising is refused too, and how this is paid for prints the arithmetic rather than asserting the conclusion.

If a link here is ever paid, it says so in the sentence

Not in a footer, not in a banner, not in a page nobody opens. Any paid link on this site carries its disclosure in the block it sits in, is marked so search engines do not treat it as an endorsement, and is only ever a book or a tool. Here is exactly what one looks like:

Everything above it on this page is a plain link or no link at all, and nothing on this site's 129 instrument pages, 142 calculators or 40 case studies is or will be one.

And the thing this site is for

None of the above replaces reading an instrument's own page and then trying to say it back. If you are working towards something with a date on it, build a path; if you want it on paper, the printable pack is every crib sheet and the whole question bank in one document. Both are free and neither needs an account.