Put your phone on vibrate! Nobody needs to hear your notifications
(Android Central)

There are very few situations in which you need to hear your phone ring. Any smartphone from the last couple of years will have a good speaker. And if you spent some more money, it probably has a pair of really good speakers - with tuning and optimization that makes it sound great. I regularly use my phone`s speakers to listen to podcasts and music around the house when I don`t want to bother with a Bluetooth speaker. But that`s where my usage ends: those speakers are for media, not for ringtones and notification sounds. How often are you in public within earshot of your ringtone but not able to tell it`s vibrating? Please do us all a favor and put your phone on vibrate, because nobody needs to hear your phone. If you`re in public, the people around you really don`t want to know that you just got a Facebook message or an email, or your Ring camera saw motion at your front door. Much like not every app on your phone deserves the highest priority when it comes to notification...