YouTube correct addresses are either https:// www.youtube. com/watch?v= N-yALPEpV4w or (as common on Android): https:// youtu.be/ N-yALPEpV4w as @uzanto kindly recommended. Both prefixes for any particular YouTube video title within Terminal work fine. Learning from TRY and ERROR (before giving up) is usually just fine with me (when having time to play around), as there is nothing wrong with this command-line “tool”. man youtube-dl says: “It is released to the public domain, which means …”
$ cd VideoDownloadFolder
$ youtube-dl correct://youtu.be_or_other_video_platforms/title