Writing a book is hard work. You need a reason to carry you through the tough times. 
Why do you care about this subject so much that you want to invest the time, emotional energy, and maybe money in order to write it? What will keep you going through the process of writing, publishing, and marketing? What is your why? 
Here are some reasons people write non-fiction books.

Excerpt from How to Write Non-Fiction, Turn Your Knowledge Into Words, Second Edition, written and narrated by Joanna Penn 

Why Write a Non-Fiction Book? from How to Write Non-Fiction Second Edition by Joanna Penn

I’m a New York Times and USA Today bestselling author, podcaster and creative entrepreneur. I write thrillers and dark fantasy as J.F.Penn as well as non-fiction for writers under Joanna Penn.

My thriller site: http://www.JFPenn.com 
My site for writers and The Creative Penn podcast: http://www.TheCreativePenn.com
Books and Travel Podcast and Blog: https://www.booksandtravel.page

New tracks tagged #writing non fiction