If you are good at your hobby, or have been doing it for a long time, then you have valuable knowledge. People who are just in the early stages of learning about it, would love to be able to know what you do!
In the past, transferring such information may have been limited to your family or local community. If you went to meet-ups or exhibitions, you might have been able to swap notes with others too. But things have changed. The internet has opened up the whole world to you – and it is really easy to turn the knowledge you have into a saleable product.
It does not matter what your hobby or area of expertise is – you might be a stamp collector, dog trainer or carpenter. Perhaps you have the best, traditional way of preparing country style Italian food. Whatever your skill – there are people in the world – who will pay for your knowledge.
But you do not have to take my word for it. If you would like to be paid once for your knowledge – go to a site where people want to pay up front for you to write about it. And they will use the material to make money themselves. OR you can go to a site where people sell their own eBooks on their favorite topics – and keep the profits.
When an you write an eBook and put it up for sale on one of these sites, you can sell it again and again and again. And it does not have to be a 300 page document. Good how-to guides can be anywhere from 10 to 100 pages, depending on the amount of detail required and technical explanation needed. As long as it is priced and marketed well, sales will follow.
If you are going to sell your own product, you will need to set up a simple website – do not be put off by this! It is easy to do yourself, and very cheap to get someone to do a one-page site for you. And that's all you need to put enough information in it to promote your book.
When it comes to pricing – keep it modest. It is better to sell 1000 eBooks at $ 7 each, than 100 at $ 20. Go for volume sales, especially in your first attempt. Do not divulge everything you know – keep something in reserve for a follow up eBook
Do your research, see what is required, and go for it!