Ben Werdmuller on what you should write about on your blog:

Whatever you want to share. That’s the long answer and the short answer.

What you shouldn’t worry about is whether what you’re sharing is valuable. If you want to share it, it’s inherently valuable: a reflection of who you are and how you think about the world.

If you want to use it to build a business, then do that. If you want to share more about yourself, then do that. There are no wrong answers.