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# Use CI/CD to build your application **(FREE ALL)**

Add your source code to a repository, create merge requests to check in
code, and use CI/CD to generate your application. Include packages in your app and output it to a variety of environments.

- [Getting started](../ci/index.md)
- [`.gitlab-ci.yml reference`](../ci/yaml/index.md)
- [Runners](https://docs.gitlab.com/runner/)
- [Pipelines](../ci/pipelines/index.md)
- [Jobs](../ci/jobs/index.md)
- [Variables](../ci/variables/index.md)
- [External secrets](../ci/secrets/index.md)
- [Services](../ci/services/index.md)
- [Auto DevOps](autodevops/index.md)
- [Testing](../ci/testing/index.md)
- [SSH keys](../ci/ssh_keys/index.md)
- [ChatOps](../ci/chatops/index.md)
- [Mobile DevOps](../ci/mobile_devops.md)
- [External repository integrations](../ci/ci_cd_for_external_repos/index.md)
- [Troubleshooting](../ci/troubleshooting.md)