A README should reduce the time to first success
A strong README is not a project autobiography. It gives a new visitor enough context to decide whether the project fits their problem, then supplies the shortest reliable path to a working result. Lead with the outcome, show a real usage example early, and put edge cases after the basic workflow.
Use a structure that matches the project
Libraries usually need installation, API examples, compatibility, and versioning. Applications need setup requirements, configuration, and deployment instructions. Templates and content repositories often need a directory map and editing rules. Delete sections that do not answer a reader's question; a shorter specific README is better than a long generic one.
Make commands copy-safe
Test every command from a clean checkout. State the package manager and supported runtime versions. If a command contains a placeholder, label it clearly instead of making it look executable. Fenced code blocks with a language hint make shell commands and source examples easier to scan.
Design tables for scanning
Tables work well for options, environment variables, compatibility, and small feature comparisons. Keep prose out of cells, align numeric columns to the right, and escape literal pipe characters. For larger data sets, use the visual Markdown table builder or convert spreadsheet data with the CSV to Markdown table tool.
Keep the README trustworthy
Update installation commands when dependencies change, remove claims the project no longer supports, and link to maintained documentation instead of duplicating it. Treat the README as tested product documentation: review it during releases and whenever onboarding steps change.