I was first introduced to Math EdTech platforms in graduate school and it has helped me tremendously in my teaching since then.
So, if you are trying to learn more about Math EdTech, here are 3 platforms to use:
Geogebra: A digital software where you can create visualizations of mathematical concepts such as plotting 2D and 3D functions, equations, curves, and surfaces. I found this tool extremely useful when explaining a topic like graphical transformations to both Middle School and High School students because they can see how the graph stretches, shifts, and inverts in real time as opposed to having to literally draw out multiple graphs.
Desmos: Like Geogebra, Desmos is also a digital software tool that is mainly used as an online graphing calculator, but has other functions as well. Many of the functions in Desmos is similar to Geogebra, but less complicated and easier to learn. If you are a math teacher/tutor, I would recommend using Desmos when plotting and explaining 2D plots and Geogebra for 3D plots and displaying any statistics related concepts.
Nearpod: A platform where teachers can develop their own lessons or use pre-made lessons for their student(s). You can think of it as using powerpoint slides in your classroom (in-person and online), but with additional functions such as formative assessments, interactive videos, classroom discussions, and games/activities. Teachers can also receive immediate feedback and post-session reports based on student responses and performance.
All three platforms also have pre-built functions, models, and/or lessons created by other teachers that anyone can use in their classroom or one-on-one tutoring lesson. These 3 resources can increase interaction, engagement, and discussion so that students can gain a deeper mathematical understanding of concepts.