This section of widget library consists of all the widget that is created by you, these types of the widget are very helpful when your project is quite big and there are multiple components involved in the build that project, so Suppose you have a widget that you have to build on Home page which is again required on some other page, so instead of creating that widget again and again what you can do is that save this widget into the local widget library and use this widget at any page by just drag and drop.