SharePoint add-in model is considered as a legacy option for extending SharePoint user interface. Please see SharePoint Framework documentation and the SharePoint Framework samples for the future ...

You're charged with engineering a new but important app that the company CEO wants all employees to add to their routines and it should be accessible from any device. The nature of the app would lend ...

These files are intended to be use individually and included in SharePoint pages via a Script Editor web part (of course, you could put the JS code directly into the SE web part). For an actual ...