If you stay free for the whole day and want to increase your income, you can start by writing simple e-books. It would be more suited if you have a knack for writing, as writing e-books would put light on your writing capabilities and help you earn too.
Whenever you decide to write e-books, you should know that all e-books need not be hundreds of pages, they can be as short as 10 pages. There are a huge number of opportunities too; it is better that you sign up with a certain writing service provider, so that you get the amount assured for your e-book as soon as you complete it.
You can also market your e-book yourself, though it is not very easy but there are various ways too. An e-book that describes common problems and provides solutions for them, you can also write e-books about a particular skill or an idea about a project. These types of e-books sell heavily. Another way of marketing your own e-book is by giving away selling rights to your buyers, this technique works excelently in increasing your income.
When considering the option of earning money by selling e-books, it is found that it helps you increase your income substantially. You can make a nice profit which may come everyday day, every week or every month. On writing a good e-book, you would be surprised by the amount of money you generate, so if you have a niche for writing then you better write an e-book yourself and see the success generated.