You can share reports and widgets that you have created with your colleagues who also have access to Insights.

How to share a widget with another user

On the widget, click the three dots in the top right corner. Click Edit widget:

Click the Share button and add the users you want to share the widget with. Then click Save:

How to share a report with another user

Open the report you want to share with your colleagues.
 Press the three dots in the top right corner. Click "Edit Report":

Click the share button and choose the people to share the report with. Click Save:

The user will then receive a notification about the shared report/widget when logged in: