You can start by simply searching for a popular topic on the internet. You may think that there is already a great deal of information available on certain things and you should start something new. However, if you want to make a profitable blog, you have to provide your readers what they want to read rather than what you intend to write.
If you don’t want to start blogging in the main stream topics, you can start you research to find a niche for your blog. You should find a topic which has presently very few sources on the internet. There are still many topics on which only few authentic websites are providing information. So, if you will be able to find at least one such topic, you can attract a niche towards your blog which can make it profitable for you.
It is very important for you to assess the potential of the topic in terms of revenue streams because you may find a good topic and readers, but it will be useless if you don’t have much competition. Furthermore, there are certain topics on which the advertising programmes like Google Adsense pays higher amount for a click as compared to others. But, sometimes the competition is too high to earn high amount for a click on advertisement. Then, you should seek for a topic which falls in the medium level revenue stream in order to make your blog profitable.
Before choosing a topic for your blog, you have to make sure that there is enough material available on the internet from where you can take help to write and publish your content on regular basis.