If you have a hobby, you can write a book.
Most hobbiests are experts. They spend a lot of time at their hobbies. They know a lot about their hobbies, so mostly they are experts.
If your hobby is coin collecting or making jewelry, for example, then why not turn your hobby into an ebook?
Teach others how to collect coins, where to buy them, how to decide which coins to collect, how to resell coins?
Teach others how to make jewelry, where to buy jewelry supplies, where to sell their handcrafted jewelry?
Teach others the different types of coins, the different types of jewelry.
Whatever your hobby is, you can teach others about this hobby. You can teach them how to do this hobby, and you an also teach them how to make money from the hobby.
Some people are enthusiastic about the hobby because they like the hobby.
Others like hobbies that make money for them also.
If you can teach others how to make money from a hobby, many people can become enthusiastic.
Many hobbies are investment hobbies, like art collecting, coin collecting, stamp collect, craft and jewelry making.
These types of hobbies especially make salable ebooks.
So if your hobby is jewelry making, crafts, collectibles, then you can turn your hobby into a salable ebook.
Where to publish your ebook: We recommend Lulu Press or Cafepress, where you can publish your ebooks for free. You can also publish printed copies of these ebooks.