The Fediverse has a video platform called PeerTube, which works a bit like YouTube but doesn't have any ads. It's really nice!
Here is a guide to how to use PeerTube, how to discover PeerTube videos, how to follow and interact with PeerTube accounts from Mastodon etc:
️ https://fedi.tips/how-do-i-use-peertube-how-do-i-follow-peertube-accounts-from-mastodon
I've tried to cover all the common questions about PeerTube, let me know if you have a question that isn't listed in the guide 