Spfx Angular 2

https://www.fmtconsultants.com/sharepoint-framework-spfx-angular2/

https://www.barbarianmeetscoding.com/blog/2016/03/25/getting-started-with-angular-2-step-by-step-1-your-first-component/

https://docs.microsoft.com/en-us/sharepoint/dev/spfx/web-parts/get-started/build-a-hello-world-web-part

rest Batch Operations

https://social.technet.microsoft.com/wiki/contents/articles/30044.sharepoint-online-performing-batch-operations-using-rest-api.aspx

https://www.c-sharpcorner.com/UploadFile/780289/save-mutiple-records-to-sharepoint-2013-using-rest-api-in-a/