The subreddit for music theory is a good place to ask questions or get music theory tips from professionals around the world. They also have great beginner's guides and resources on the side panel.
I think she does a good job of explaining and demonstrating how to vary dynamics on the violin. The only negative is she has a tendency to over explain, but it is still a great learning tool and some beginners may need the over explanation.
The tutorial was well done with good practice tips, and moved along at a decent pace. The one thing that I didn't like was that there was no talk about color or dynamics while playing and practicing.
