How-to: [Channel settings] - [Teammates] - [Members] - [+Invite new team member]
When inviting new members to your channel you can set their status to either owner or member. Using the [invite link] there are a few other ways to invite new members to your channel:
Copy and paste the link
Email invite link
The same link can be used by multiple people, and once your team member has finally joined you can easily freeze the link so no one else can join. Invitation links have expiration dates(30 days), once the invite time elapses, you will have to resend a new link.
Owner: Given all rights. A channel can have multiple owners.
Roles are given some privileges, which can be set directly by the channel owner. ( → Learn more about Roles and Permissions)
Team Members with owner permission can modify the permissions of other team members in the channel.
How-to: [Channel settings] - [Teammates] - [Team Member] - [+Edit team member role button]