I figure short is better than nothing right? I'm thinking about doing a Q&A but not sure if many people would be into that. If you are, let me know in the comments or ask anything you'd like answered
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