As a short answer 1
denoting or relating to products, services, or interests that appeal to a small, specialised section of the population.
concentrate on and become expert in a particular subject or skill. “he could specialise in tropical medicine” confine oneself to providing a particular product or service. “the firm specialised in commercial brochures”
You need to pick something you love or already know about, the beauty of human nature is everyone is different, but some people are similar and all over the world there will be people that are interested in the Niche that you chose to talk about. It has to be a perfect Niche for you, think about what hobbies and interests you have and something that you are going to keep driven about, you wont get the traction and success you need unless you stick at it for a while, your website traffic is not a case of ‘Build it and they will come’ you have to work at it, regularly for at least 35 weeks until the search engines start taking your site seriously! The more Specialised you can make it the better your special keywords will rank. More about Keywords in another post, but as a tool to help you here is a tool I highly recommend called Jaaxy
Look for keywords on here that have high volume traffic (over 40 and the more the better) and are low on competition under 300 ideally around 100. After you run through about 15 keywords (brief description/something you would type in to search for it yourself) and get these scores you know theres HUGE potential for your website. Heres a search I did before I built this website about Wild Orange Essential Oil So this tells me 144 people search the term ‘Wild Orange Essential Oil Benefits’ on average (‘Avg’ column) every month! If I rank high for this keyword I would get 25 visits/Traffic to my website every month and this is because 22 competing websites (Quoted Search Results – ‘QSR’ Column). The KQI is the Keyword Quality indicator and this is like a traffic light system Green is Great, Yellow is OK and Red is poor. Now the SEO is only 96 so this is quite low so as I say aim for 100+ if you can the reason I still went for it is because I love the smell, use it daily and its one of my best sellers and I can talk about it a lot so I’m happy to go ahead and take a bit of a risk. I even managed to get the Domain name spot on which is also going to help it rank.
Don’t try and confuse people by talking about too many things I’ve been there, done that and wasted another logo’d t shirt! Do one website per niche, nurture it and watch it grow. Until you get to this point don’t start another one again I have done this and it gets confusing and like hard work and more hours. Grow the first one first!