A number of video types work well in an online environment, each with its own strengths that make it appropriate for teaching certain types of content. One of the most powerful types is whiteboard videos.
Whiteboards are basically blank canvases on the computer onto which you can write, draw, or place different sorts of content. The ability to draw is particularly helpful for instructors teaching quantitative courses, as instructors can write out equations freehand, rather than going through the laborious process of typing them onto a computer. But drawing can be used in other subjects as well. An art instructor can teach how to identify a particular painting style by placing images of different paintings on the whiteboard and circling their defining features while recording the lesson. Whiteboards also work for assessments. Students can demonstrate their understanding of a physics principle by recording themselves solving equations on a whiteboard while describing the steps. This allows the instructor to see whether an error in the student’s thinking has led them astray.