Notification options & Notify groups

Configuration
1

I am a bit confused about the notification options in Home Assistant. I’d like to use the companion app for notifications and I want to use a few groups: all my devices, all other persons devices and all devices from everyone in the home.
This way I need to change only the group properties instead of all automations. But I cannot figure out how. And help pages aren’t helping.

This is on the help page:

# Example configuration.yaml entry
notify:
  - platform: group
    name: "My notification group"
    services:
      - action: html5
        data:
          target: "MacBook"
      - action: html5_nexus

I have no idea how to use this with Apple only devices. What is a target? And that is that html5?

There are also two options for sending notifications, but what is the difference?

  1. Notifications ‘send a notification message’. No idea, there are no items when adding a device or entity.
    Yaml: action: notify.send_message
  2. Notifications ‘send a notification’. I have to give a target, but what are targets and how do I make one?
    Yaml: action: notify.notify
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