In a chat group someone asked the other day how does one blog a book, or do you just write posts about the book for marketing purposes? Personally I think you can go either way, but as a writer, trying to establish yourself? Write a book.
It can be fiction or non-fiction, both can work wonderfully as a series of blog posts. Just one thing to remember: once posted it is considered published because it will be in the public domain. So no entering competitions where it explicitly states 'not published before'. Competitions can be funny that way, but the rules are the rules.
On the other hand, if people like your blog posts, ie your book very much, they will tell you.
To give an example: Yip I have one of those on hand - my friend, Vanessa Wright, wrote a series of posts about her Muse. And they were not only very funny, people like them so much that they had been pestering her to publish them in a book.
And to keep things interesting, she added a few stories, not on her blog - now, that's the part that will sell the book. People have seen and loved her posts, and the book will give them more of that.
Well, the good news is she is busy with the final edits, the cover looks amazing, and hopefully soon I will be able to twist her arm to let me introduce her muse to you right here on the Broomstick.
My attempt to complete a non-fiction book has been done the same way. Using the 35 Day Author Blog Challenge I have written several posts to be included in the book. Some of the posts were edited before inclusion, simply because of the style, but others were used as is.
One or two posts were expanded because I don't like long-winded blog posts, but the topic required more detail before it would have worked for the book.
Whichever way you decide to use your blog to write a book, enjoy the process and may your readers enjoy the journey with you!