I led a breakout session today at Chattacon. ( https://chattacon.org/ ) on Middle Grade Fiction. Why I am by no means an expert, I have spent my time in my writing career learning this genre and it's close counterpart: Young Adult. For those who were there and would like the slides or for those who are interested in the presentation I have included the link here. Let me know in the comments if for any reason the link does not work.
The ugly link: