How should I price my online training course?

Price is hard.

I see many people putting the price too high for the value I think they provide - particularly on Udemy, because of the massive discounting that goes on through that platform.

Next time I create courses I'll be aiming for smaller courses about 3-4 hours, at about $39 - $59

My current course is about 18 hours at $175 - $299, so I'm pricing at about $10 to $15 an hour. 

But I'd advise you not to worry about price yet. 

Focus on content and scope. And benefit to the student.

Experiment with the tools and technologies because it takes time to learn how to edit these videos etc.

I will say however that the general advice "see what other people are doing, then price a little under that" sucks. If you don't offer anything that is better value, or better quality, and can't be sold for the same price (or a little more) then don't enter that market.

Focus on the value you can add, then price accordingly.

Use other courses as guides for what you like, and don't like, and do something different.

But make sure that your course, your content, your approach, your scope, and your pricing, are true to you, and you can justify the price on its own terms based on the value your course adds, not in terms of reference to the competition.