I like how the site has a set of short videos demonstrating each "teacher move" to support learning using "Accountable I think these would be helpful in training/professional development, as well. The fact that these "moves" were observed in effective classrooms (i.e. research-based) is good to know.
Check out the activities on this site, which give students immediate feedback. I looked at the math activities for Algebra/Geometry. Students can test their understanding of concepts quickly using this platform. Check it out!