Profile, then Settings, then Reminders. Two switches, both on by default.
Habit Reminders. A daily nudge when you haven't completed a habit yet. One a day, and nothing if you've already earned.
Screen Time Left. A heads-up as the time you bought starts running out, so a block doesn't land mid-sentence.
Separate from these are the routines you set per habit, which fire at times you chose. Turning off Habit Reminders doesn't cancel your routines.
Aura doesn't send marketing notifications.