I will be going out of town for Thanksgiving week so I will see you guys when I get back. Until then, enjoy some tippy taps. Leave me suggestions on what you want to see next!
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