Once again I apologize for the poor quality, I still don't know anything about editing. I do have a discord server for the channel that I'm working on, that way I can hopefully interact with all of you more ^^
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app