Blogging is a step by step process in which people write something interesting which is meaningful and useful to others. But the process of writing involves lots of research and hard work. This research is a result of interest. If people are interested in any particular topic then he can spend a potential time in researching things on internet.
I am giving an example of geek who is interested in iPhone. If the person loves iPhone then he love to research online for various Jailbreaking tools and apps which he want to available on his iPhone. It is very much satisfying job for a geek to write on iPhone because he grabs all the sufficient knowledge on iPhone. And he can write all the tactics about iPhone by some new non-stop research.
Now take an example of a newbie blogger who write about making money online. It may possible that he has no knowledge about how to make money online. He does this job because it is a highly demand and attractive trend. It may possible that he could not earn a single penny online but he writes about various tricks of making money online by reading some other popular blogs.
It is not advisable to write on the topic which is not a matter of interest to you. There is a very big reason behind my point. If you are writing something beyond your interest then it may helpful for you for some time. But you need to be regular on your niche which is a very difficult job for anyone. For making a successful blog you should write one or two articles daily. Without having knowledge of the subject how can you manage to write such a huge amount of articles (I am talking for a long term may be 6 months or a year).
How to decide a niche
It is not much difficult. You need to choose a topic on which you can write nonstop. If you are a computer geek you can choose computer tips and tricks as your niche, if you are a sportsmen then you can choose sports as your niche. If you like politics you can give political updates to your readers. You can choose among given niche Photography, Web designing, Computer, Hacks, Apple, iPhone, Nature, Geography, Weather, Entertainment, Movies, Gadgets, Fun, Romance etc.
Choosing a correct niche is a deciding factor for the success of blog. Never make compromise with your interest. Take a time and decide the topic on which you can write nonstop. The relevant topics on which you can give suggestions to other people without any difficulty. Remember your basics and start blogging from today with a correct niche. Success is waiting on your door.