It serves two purposes on a PeerTube instance: it ensures all videos can be played optimally in the web interface, and it generates different resolutions for the same video.
Administrators have full control of the content they accept and they decide whether sensitive content (violence, pornography etc.) is displayed by default or not.
Enable <a target="_blank" rel="noopener noreferrer" href="https://docs.joinpeertube.org/admin/configuration#live-streaming">live streaming</a> for your instance
Read the <a target="_blank" rel="noopener noreferrer" href="https://docs.joinpeertube.org/maintain/configuration#scalability">scalability guide</a> if you plan to have many users or viewers
Enable or disable signup, <a target="_blank" rel="noopener noreferrer" href="https://docs.joinpeertube.org/admin/managing-users#registration-approval">approve manually new users</a> or set upload limits