Please subscribe and like this video. I recorded this a few days ago but as it's quite a longer video I was unable to upload it till i got home from my break away that i had, seeing my family.
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