GNOME Tips
Not sure what this would look like, just opening the issue for discussion. Plus how much overlap would a Tips app have with the Tour app or the Help app.
Relevant Material
iOS Tips app: https://support.apple.com/en-ca/guide/iphone/iph3afc3b3fc/15.0/ios/15.0
Get the most from your Apple devices with helpful hints and hidden gems.
Windows Tips App
The Tips app in Windows 10 is full of short-and-sweet tips that help you get the most out of Windows 10. Each tip has a button in it, so you can try it out with a single click or learn more.
Pixel Tips app: https://9to5google.com/2019/03/22/google-search-pixel-tips/google-search-pixel-tips-6/
Edited by Allan Day