If you like to draw when you are explaining a concept, you could add these drawings to your online videos.
Here are some examples of how different creators have used drawings, whiteboards and chalkboards.
An actual chalkboard:
One of the first people to popularize using a whiteboard on video:
Using a flip-chart:
Using a combination of animation and talking head at the same time:
Talking head, then video of Doug sketching at high speed:
Drawing on a Power Point Presentation: