Microsoft Graph toolkit is an opensource web-components, connected with Microsoft Graph API. So we can use these components to build our application without involving much code. Even though the back-end code connected with Microsoft Graph API, we have to specify the Client ID and Scopes to the components and along with the associated provider.
Use the below video explains how to use the web-components of Microsoft Graph tool kit in your application.
The below video helps to register the app in Azure App Registration portal.
And also I have created separated Github repository msgraphtoolkitsamples contains the scenario based examples,
Microsoft Graph Toolkit Examples