Documentation is the interface your engineers ship to each other.
Write for a decision
Technical writing succeeds when a reader can act correctly. Begin with the audience, the decision or task, and the knowledge they already have. Put the outcome and prerequisites before background.
Use concrete nouns and verbs. Replace vague claims with conditions, examples and observable behaviour.
Structure for scanning
Organise around the reader's workflow. Headings should answer likely questions, procedures should have clear order, and warnings should appear before the risky action.
Examples must be realistic and maintained. Incorrect sample code damages trust faster than missing prose.
Treat documentation as a product
Keep documentation near the system it describes, assign ownership and review it when behaviour changes. Test important procedures by asking someone unfamiliar with the work to follow them.
Measure search terms, failed tasks, support questions and stale pages. Good documentation reduces interruption and preserves knowledge when teams change.