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Key points
1,870 points pulled out of 417 guides. A guide makes its point in a coloured box, and until now you had to be reading that guide to see it.
Three kinds, because that is what the guides themselves distinguish between: the thing to take away, the trap to avoid, and the detail worth knowing.
What to remember
The point of a section, stated plainly. The thing to take away if you read nothing else.
903 points from 409 guidesWatch out
The traps: the deadlines that bite, the assumptions that cost money, the mistakes people actually make.
397 points from 175 guidesWorth knowing
Context, exceptions and the detail that changes an answer once you know it.
570 points from 201 guidesEvery point is taken from a guide, and the guide is where the rules and figures are kept current. These are general information for education, not advice. See also situations like yours, the arithmetic on its own, every question the site answers and the A to Z of the site. Last reviewed 2026-09-08.