Can someone explain how notifications work?

Hi.

I’ve created a calendar for Administrator user but linked it to a new employee account, the other employee can’t see the calendar…

I temporarily use it for my own needs and find that I don’t actually get alerted to calendar events I put in. So it seems it’s only useful as a reminder (after you remember to check it?)

I’ve gone to notification settings and added following of doctypes “job applicant” and new applications that come in via email on our job email, I do not get a notification about.

What’s going on? What am I doing wrong?