A fork is a copy of an existing repository. Forking a repository allows you to freely experiment with changes without affecting the original project.
Click on the Fork button on the top right corner

Once the “Create a new fork” page opens, review the information and then click Create Fork

Once your have created the fork, you will be redirected to your forked repository. You can see that you are in your forked repository by looking at the top left corner of the page. It should say PPCC24-ALM forked from microsoft/PPCC24-ALM.