You can read more about Azure Repos on Microsoft Docs at https://docs.microsoft.com/en-us/azure/devops/repos/get-started/index?view=azure-devops.
There are a number of good videos and walkthroughs available on Microsoft Docs that will show you what you can do with Azure Repos. Check them out at https://docs.microsoft.com/en-us/azure/devops/repos/git/index?view=azure-devops.