A Canadian gentleman has a YouTube channel teaching Sudoku. He is very knowledgeable and entertaining. He calls himself The Sudoku Guy, and the name fits.
A story about the Sudoku Guy from the CBC: https://www.cbc.ca/news/canada/british-columbia/sudoku-guy-online-puzzle-tutorials-1.4580449
You can find the Sudoku Guy’s YouTubeChannel here: https://www.youtube.com/channel/UCd8JaOdfEWcJOtwG6YayW0w
And as a tease, the Sudoku Guy’s first video