You offer a service or product and are an expert on it. Often customers want to learn how to do a task that takes a certain skill, then pay once they find it difficult. Why should anyone pay you for your skill or product over someone else? They will pay you because they trust you and the way you build trust is to teach what you do. You only need to teach enough so customers know you are an expert but you should teach an end-to-end short course so the customer feels they could if they wanted to do it but in the end would just prefer to go to you, the expert.
Working on the marketing for a local flight club (Golden State Flying Club) I videotaped their FAA Approved Private Pilot Ground School Classes. I then put segments of the classes on YouTube. These videos have tens of thousands of videos and hundreds of comments. No one questions if Golden State Flying Club is an expert at teaching flying because it is made so obvious through the videos there isn't any doubt left.
Providing proof that you are an expert isn't difficult, it could take a few hours of your time but once it is done and you post it then it is up forever. Be sure to leave a very descriptive title of what you are teaching so it can be easily indexed by Google.
Upload videos to more then one video sharing site for best results. YouTube.com and Vimeo.com are two popular ones. Get your friends to view the videos one time so you can build up the number of views from unique visitors. You might also buy YouTube Google Ads to promote your videos and be sure to add a video page onto your website with these videos embedded.
More ideas on video marketing