Going into this program, I already knew how to use Desmos and Geogebra as a student, but was not really aware just how many resources they have for teachers. Recently a peer gave a presentation on Teacher Desmos, and showed that students can join a Desmos class online, where the teacher can assign interactive activities in-class or as homework. There are many already prepared activities, some made by the Desmos team and some by teachers. These can easily be remixed and edited. Geogebra too has many activities ready to go.
I will almost certainly be using these resources in the future. I’m impressed at the simplicity of setting things up, of blending synchronous and asynchronous work, and of monitoring and assessing students.