You can control whether the notification light blinks when you have unread notifications:


When you receive unwanted notifications from an app, touch & hold the notification, then tap Turn off notifications.
To review all apps and adjust whether they can send notifications:
Do one of the following:




If you want an app's notifications to be less intrusive, you can categorize them:
Option 1: On a notification
Option 2: In Settings
To adjust the volume level of all notifications:

You can modify the notification sound for all apps, or assign a distinctive sound to notifications from a specific app, replacing the default.
Do one of the following:
To let an app's notifications be heard when Do Not Disturb is on:

If an app isn't sending notifications but you want it to:


If you want to be able to snooze your notifications, turn on snoozing:

If you've set a pattern, PIN or password, you can control which type of notifications show on your lock screen and prevent them from revealing private information.
To adjust notifications for all apps:
To hide sensitive content on your lock screen, turn Sensitive notifications off 
You’ll get lock screen notifications for an incoming email or chat, but they won’t include message details.
For finer control, leave this on 