If you are thinking about starting a profitable blogging business, there are a few factors to consider when selecting your topic.

Public Interest

Your goal is to attract millions of visitors on a monthly basis. You need to choose a topic that will appeal to the masses and stay interesting for a long time. Begin by thinking about general topics such as technology, food, art, fashion, health, sports and so on. Once you choose your topic you need to narrow it down to something more specific that still has mass appeal.

Your knowledge on the Topic

It is always best when choosing your topic to pick something that you have interest in. You will need a steady stream of content, so you are going to be blogging about the topic each and every day. If you are not an expert at it, this is OK too, because you are going to be. This is why it should be something of interest to you. You are going to be keeping up on the industry by reading on the subject everyday, and talking about what is going on. If you are blogging about something just to make money, after a few months you will resent having to keep up on the posts.

Longevity of the Topic

Longevity is important to sustain an income. If you make a blog about a fad that will pass in a few years than you will have wasted your time. You want a blog that will get better over time, keep peoples interest, build ranking within the search engines.

So when you are choosing a topic for your blog, take your time. It is the building block of everything else that is to come.