I am a high school math teacher who used to be an engineer in the computer industry. I have always used technology in my classroom because it is a natural extension for me and it is a way for students to quickly grasp concepts that are often out of reach with just a textbook. I do not lecture in my class. Students do investigations that lead them to discovering whatever topic we are studying. I am new-ish to Geogebra, but it is a tool that I am excited to master.