If you are blogging for fun, then you can think of blogging about anything you want. But if you are serious about EDIT: link removed, them you should choose your blog niche very carefully. When we chose a wrong niche for our blog, that will lead to a unsuccessful blog. Here is the list of mistakes we generally make when choosing a niche for our blog:


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1. Highly competitive niche: Some of highest competitive niches are credit cards, loans, insurance, mortgage, internet marketing, blogging, seo, EDIT: link removed, weight loss, health, computers, mobile phones, cameras etc. If you are thinking of blogging about and making money in highly competitive niches like some of niches I mentioned above, you have to remain ready for lots of competition and may have to wait for years for any big results to come in your favor. No doubt, there is lots of money you can make in these niches, but getting on top in these niches is also very difficult. So the key to success with blogging will be choosing a niche with lower amount of competition.
2. Choosing a niche you don’t understand: there are some people who choose to blog about a niche they don’t understand and are not knowledgeable about that niche. No doubt, we can learn about every niche when we spend some time on it. But when you are choosing the niche for your first blog, you should go for a niche you are most knowledgeable and passionate about. When you to chose a niche of your interest, that will help in creating and promoting your website in search engines.
3. Blogging about personal matters: there are some people who start blog with their names or surnames and discuss their personal matters on that blog most of the time. If you are serious about making money with your blog, I would suggest you to choose a topic on which you remain focused on most of the time on your blog like software reviews, digital cameras, Google products, Social media, blogging, seo, affiliate marketing, money making, weight loss etc.
4. Covering lots of niches on the same blog: no doubt you can be knowledgeable about many niches, but don’t cover too many niches in the same blog. Stay focused on a single niche only on a blog. When we try to cover too many niches, you face the problem of how to monetize this blog because we have readers of different interests. And when we blog about a particular niche like money making only on my blog, most of readers on my blog will be interested in money making matters and thus I can monetize my blog more easily.
5. Copying what others are doing: there are some people even who decide their blog niche just because of someone else is able to make some money in that niche without thinking about their interest or knowledge about that niche. You cannot b successful with a blog if you are not passionate about the niche you chosen for your blog.

Yes,very true.It is very difficult to achieve success in competitive blogs.It is better to start something which people look for and at the same time ,there is less competition.