Here are some general tips on what makes a good video:
Our instructors choose from a variety of options when creating their video. If you have a pre-recorded webinar presentation or a screencast of a slideshow, that can be a great place to start. Some instructors use screencasts of presentations they have recently delivered on the course topic. If you don't have either of those, create a 30-minute presentation on a specific aspect of your expertise that you might present at an industry conference or webinar.
Although it may seem counter-intuitive, more specific topics are always better than general ones. For example, solar design expert Ryan Mayfield created an excellent free short course Arc Flash Calculations and Insulation Resistance Testing. The topic is extremely specific, which narrows the audience, but the people who sign up know exactly what they're looking for and what they'll be learning about.