GitHub Actions provides powerful CI/CD capabilities directly integrated with your . Start by creating .github/workflows directory with YAML workflow files. Each workflow defines triggers, jobs, and steps. Common triggers include push, pull_request, and schedule events. Define jobs that run on runners (Ubuntu, Windows, macOS). Use actions from the Marketplace for common tasks like checkout, setup-node, and docker-build. Implement matrix builds to test across multiple versions and platforms. Cache dependencies using actions/cache to speed up workflows. Use environment variables and secrets for configuration. Implement deployment jobs with environment approvals for production. Use service containers for databases in integration tests. Implement artifact upload for build outputs. Use concurrency controls to prevent parallel deployments. Implement status badges in README for visibility. For mobile apps, integrate Fastlane for app store deployment. Use GitHub Pages for documentation deployment. Implement security scanning with CodeQL. Set up branch protection rules requiring status checks. GitHub Actions supports self-hosted runners for custom environments. Monitor workflow runs with the Actions dashboard. Price is based on compute minutes with free tier for public repositories.