On your phone in particular. I have all turned off except for signal messages from a few people.
Side question: Have you or anyone you’ve known “rang the bell” on content on youtube, twitch, etc? For how many channels? What (kind of dystopian nightmare) was that like?
Mainly just notifications from app stores like Google Play, F-Droid and Nutaku. I do occasionally receive notifications from other apps such as Google Opinion Rewards and Proton Mail. Then very rarely, I do also receive calls and texts but it’s mostly just scams and otherwise unknown numbers.
As for your side question, I used to because it used to be useful. Several years ago, Google broke YouTube’s email notifications and refused to fix it. Then at some point, they acted like no one wanted them and just removed them. Luckly, RSS feeds still work, YouTube doesn’t tell you they exist but they do.