Quality in technical writing is built through structured review, not just careful first drafts. A docs review checks three things: accuracy, meaning whether the doc matches the product; completeness, meaning whether edge cases and error conditions are covered; and clarity, meaning whether a new reader would get it. The reviewers should be a mix of a technical reviewer, who is an engineer or subject-matter expert verifying that claims and examples are correct, and a copy editor, who focuses on language, grammar, style, terminology consistency, and tone. When possible, a fresh reader who is not the author should test the doc, because authors fall into the curse of knowledge and no longer notice the assumptions and ambiguity that trip beginners up. The opposite trap is the "dumb it down" reflex: clarity is not the same as oversimplification, and important nuances, constraints, and edge cases must be preserved. Precision also matters separately from accuracy, since a precise but inaccurate number is worse than a rounded accurate one.
The most important quality check for examples is a smoke test: running the example exactly as written, in a fresh environment, and confirming that the documented output appears. Examples that fail the smoke test should not ship, because broken examples erode trust in the rest of the document. The golden path is the shortest, most-supported route through the product to a useful result, and docs should make that path obvious and well-paved. Edge cases, including non-default inputs, error conditions, limits, and boundary behaviors, are usually covered in reference or troubleshooting rather than in tutorials, but they must be covered somewhere, because the happy path and the unhappy path both deserve documentation.
Maintenance is the ongoing work of updating content as products, APIs, and workflows change, and stale docs are a product problem because they create support load and lead users into avoidable mistakes. The single source of truth principle says that information should live in exactly one place, with other pages linking to it rather than copying it, so updates propagate automatically and the docs never contradict each other. Duplicate content is the failure mode of that principle, and once two copies drift apart, a reader following the wrong copy wastes time or hits bugs. A useful habit for maintenance-friendly writing is to prefer clear structure and reusable patterns so updates can be made quickly when the product changes. For most features, the minimum viable documentation is a short overview, a quickstart, and a reference for every public option, with other doc types added later once support feedback shows the gaps.