Every group has a home page with what matters most, channels for writing and for voice and video, threads for side conversations, roles with their own rights and its own emojis.
Joining
You join open groups straight away. For others you ask or need an invitation. New members are welcomed and, where the group offers it, choose their roles themselves.
A group of your own
You start a group under “Groups”. As its founder you set up channels, roles and rules and give others roles with their own rights.