I like this page from Nature Play which touches on many of the topics I wrote about last week, including Schema of Play (which they call Movement Urges), “How Many in the Mix” which relates to the Stages of Play, and Play-Ally about the role of the adult in play-based learning. They also have a nice section on Types of Play, which include Exploratory, Repetitive, Physical, Role-Play, Imaginary Play, Creative Play, and Therapeutic Play.
On another page, they have a great discussion about Child-Led Play. Check it out!