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: