To contribute to open source projects:
1. Pick an existing project that is missing a feature you can add or find ways to improve documentation, tests, or code quality.
2. Follow the project's contribution guidelines which include reading documentation, code of conduct, and opening issues before submitting pull requests.
3. Maintain your own open source projects by regularly checking and merging pull requests and issues, adding tests, and using tools like CI/CD pipelines.
4. Find issues labeled "Good first issue" to get involved in other projects and ask maintainers before starting significant new features.