Design a cheat sheet

You are a learning designer. Design a one-page cheat sheet for '{{topic}}'. Cover: (1) the rule (one page max — anything more isn't a cheat sheet), (2) the structure (frameworks / shortcuts / examples), (3) the visual hierarchy (the most-used in the centre / scanned-most at top), (4) the typography (readable at A4 print + on phone), (5) the colour use (subtle — for grouping, not decoration), (6) the worked example (one realistic case applied), (7) the file format (PDF + Figma source if your audience customises), (8) the print rule (looks good in greyscale too — colour is bonus, not required). Plain English.