Sorry every kitty for the lack luster video. After being gone from the channel for a couple weeks, it seems that I need a little time to get back into the swing of things. For the Q&A next week, be sure to post your questions so I can try to answer them.
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