I actually don't believe there is a "best ukulele teacher" on YouTube! I don't use YouTube all that often though, so I guess I'm biased.
So, I know I'm not answering your question with the answer you wanted, but anyways, I basically learned how to play ukulele by looking up "Ukulele Basics for Beginners" on YouTube, then watched a few of the videos. After that, I downloaded an app called Yousician, but after a month of using it, I didn't learn anything. I know some people have had success with it, but I did not.
What I would suggest doing would be to watch a few "Ukulele Basics" videos (on YouTube) before you actually play. Then, I would just strumming on it, learning the feel of the ukulele. After that, I would highly suggest downloading and app called "guitartuna." It basically has a tuner, that shows you how to tune your ukulele. Along with that, there are a few "games" on it, to help your learn the chords. I would play the games, learning the four chords that it teaches you. It has a free version, which is the one I use. I wouldn't suggest buying a subscription.
After you learn those chords, you can search up some basic ukulele songs (on Google, YouTube, or Pinterest) and learn those.
Once you learn some basic songs, you can learn a few more chords, then more songs! And continue the process until you.... well until you want to stop!
So that's how I wish I self taught myself, and how I would suggest anyone to self teach themselves.
I know you were looking for specific channels, so I'll link a few down below in the spoiler. I've only watched a few of there videos, so I cannot say how truly amazing they are, just that they are decent channels from what I've seen.
Also, congratulations on your new uke! I hope it brings you just as much joy as it brings me!!
okay, bye!
Edited by MushuTheHamster47, 23 October 2020 - 09:55 AM.