James Clear wrote a great piece about systems vs goals, how the system is more important. He points out that thanks to his system of writing for his blog, he’s written enough for a book without it being his goal to do so.
In the last 12 months, I’ve written over 115,000 words. The typical book is about 50,000 to 60,000 words, so I have written enough to fill two books this year.
He writes within a few distinct themes, so a number of his articles probably could be stitched together to form a cohesive book. Of course, the point he’s making is deeper.
The habit of writing anything helps you to learn the micro-skills involved in writing something more meaningful. Getting used to the feeling of publishing your writing and having people read and judge it is another valuable development.
If you want to write a book, start writing every day. Then, start publishing every day. Finally, write 10 larger blog posts that feel like chapters to a book. The internet has made it so easy to do this stuff. Just do it.