How can I customize notifications?

I only want notifications on if someone is at my door. I don't care about feature notifications and don't want them popping up on my phone, not to mention when I click on it, I don't see what it's talking about , the red dot is always there telling me I have 4 notifications. i see them but it doesn't go away and I don't care about features. I just want to know who's at my door. Sick of spammy notifications.Any way to customize what notifications I get?