1. Go to Settings>Apps & notifications>Notifications>App notifications2. Here, you'll see a list of all apps installed on your Android device. Scroll and tap any app whose notifications you want to customize.3. Next a list of all types of notifications the app can send will appear. Toggle each type of notification on or off as desired.1. For finer control, tap a notification type and you can change its sound, vibration, and other settings. You can also toggle the main switch to block all notifications from that app.4. Some apps have extra notifications in their app settings. This is indicated by the Additional settings in the app button. Tap it to access the app's settings, and customize further notifications there. Obviously, what you see depends on the app.