# Concepts for GitHub Actions

Learn the core concepts that you'll need to understand GitHub Actions.

## Links

* [Workflows and actions](/en/actions/concepts/workflows-and-actions)

  Learn about the concepts of workflows and actions in GitHub Actions.

* [GitHub Actions Runners](/en/actions/concepts/runners)

  Learn about the concept of runners in GitHub Actions.

* [Security in GitHub Actions](/en/actions/concepts/security)

  Learn about security as a concept in GitHub Actions.

* [About GitHub Actions metrics](/en/actions/concepts/metrics)

  Learn about the GitHub Actions metrics available for your organizations and repositories.

* [Billing and usage](/en/actions/concepts/billing-and-usage)

  Understand which GitHub Actions usage is included with your plan, when charges apply, and which usage limits administrators can manage.

* [About Actions policies](/en/actions/concepts/about-actions-policies)

  Govern how GitHub Actions workflows run within your repository, organization, or enterprise.