People are looking for all sorts of things on the internet. You have virtually thousands or millions of topics at your disposal. Your chosen niche site can be any specific topic. It is best to find one that has a lot of people searching for it but not many websites. Or, you can try the other route and go with what people are most searching for, but there will be a lot more competition. Some big topics that people are always looking for are; weight loss, skin care, business opportunities, dating(relationships), jobs(employment), and financial(insurance,debt). If you choose to go with the big topics you will need to do a lot more advertising or develop advertising strategies that are unique. Remember, nothing is impossible. You can develop your own methods and/or use a combination of learned techniques. You will also want to choose something that you know about or have a great interest in. If you are going to make a niche website or blog, you will need to be coming up with fresh content all the time. You can provide what you already know or can do research to find things out and then re-explain them on your blog. If you were to do a niche such as “debt collection” , and you knew nothing about this topic, then you might be bored trying to find information to write on your site. Make sure you are having fun with it or you will not want to work on it every day.