Netlify is highlighting a different feature each day in December. To understand what triggered a site update, you can check the Deploys page in your project's Netlify admin for links to commits that brought about the change. This allows you to see the code or content changes responsible for the update and provides insight into what to expect in the build. By clicking on the git hash visible in each deploy summary, you can take a direct link to the commit in your GitHub, GitLab, or Bitbucket repo.