I would add that several browser addons that send you to a peertube version of a youtube video exist as well. Can make life somewhat awkward though as quite often the peertube version is actually of a lower quallity. If you are a creator if you use an instance that allows youtube import you can also automagically import videos from YT to your PT channel as well

PeerTube has its own frontend (User Interface). Do you mean a “provider” like PeerTube.wtf?

I have created a Mastodon list just for PeerTube “subscriptions”. I just swap over and then have a list only full of videos. On mobile the Surf app could do something similar.

There's the mobile app for Android, and on my Desktop I just use the website.

I use grayjay (android and I think desktop now too?), which works for most streaming services, such as PeerTube, YouTube, Nebula, etc. One app for all the things.

PeerTube isn't a single website like YouTube - it's a decentralized platform with many different "instances" (seperate websites) that all talk to each other, so you just pick one instance like peertube.wtf or peer.tube to start watching and creating content.

Im only aware of the main one, is there alternatives? Do you mean like themes?

The website works fine. I don't understand the app obcession people have. Though newpipe is an option if you must