You can operate notifications in the Action Center:
1. Select the Start button and go to Settings (icon with the gear).
2. Choose the System menu and select Notifications & actions.
3. Scroll the list down and toggle the switch off against the app which notifications you don't need.
If you click the name of the app, you can see and change the whole range of notification preferences for this app.
More information and the source article you can find here.
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