This is one of the most asked questions from anyone new to the blogging world.
You have to sit and think this one trough as it can lead to your success or your failure.
Write about your passions, your hobbies or anything that is close to home for you. Don’t write about anything your not passionate about even if it means you know every and anything about a specific topic.
If you are not passionate about the niche you chose you might as well give it up right now because not far in the distant future you are going to feel like its a burden to write a new post and that will turn your blog in a ghost town real fast.
Read this article about what to blog about.