You can invite other teachers to your group. They can be for example co-teachers or subject teachers. You can also invite students. These roles have different rights. So, pay attention when inviting others ;)
Invite teachers by pressing the add people icon (1) or invite students by pressing the invite students button (2). In this view you can also see all the invites - pending and accepted.
Invited teacher will have same rights for the group as you. They can add goals, moments, edit and delete those too. Share those invites only to the people you trust.