Blog is a website or webpage which is updated regularly by individual or by a group to share some useful and interseting contents to users.
the purpose of blogging may be to make money or to get more readers and fan. So the blog should be updated regularly, so choose a topic accordingly, for example if you are choosing to create a blog about yourself, how many pages you can write about you may be 5?, 10?. if you are a more famous person like actor or television personality, you can write blog about you and keep posting your latest activities as post. you can get more fans visiting your blog.
So choose a good topic to keep the blog updated regularly. topics related to travel, technology, food, current affairs, current trend etc.