People are turning to audio and visuals when it comes to technical subjects. However, you should consider doing an ebook first and turning it into an audiobook through a resource like Audible's ACX platform. You can hire a producer either through a royalty share program, so you don't have to shell out upfront cash, or you can do a pay-per-hour hire as well.
To earn from affiliate marketing takes a lot of work so don’t expect instant results. You need to know how affiliate marketing works, get the right product, create the platform and run the most suitable ads to generate quality traffic to generate leads. If you don’t get it right the first time, don’t worry, you can try it again and improve your mistakes. Remember that learning from other affiliates would help you overcome a lot of errors as well.
Cafe Press: This website allows you to create digital designs that can then be sold on the platform. You'll earn a commission for everything that sells and you'll never have to deal with logistics like printing, warehousing and customer service. If you have some graphic design skills, then this is a great potential source for your web-based income.