Notifications are very important on your android phone, but unfortunately some app developers try to get your attention with push notifications on promotional messages, software updates and other enticement which becomes disturbing most times.
Instead of deleting these apps, here is what you can do in order to find a better solution to it:
Step 1: Go to Settings option on your phone
Step 2: Click on Sound & notification
Step 3: From Sound & Notifications, click on App Notifications.
Step 4: A list of apps appears from which you can decide if you want to turn notifications off by tapping the block option on the app targeted.