Product niche business: Think about your own business or life to find a product that deserves a wider audience. You might be inspired to create your own product. Perhaps you have products or services or information available already that you can market.
This topic speaks for itself. You can sell somebody else's products from Clickbank, Clicksense or somewhere else or you can create your own digital product for people to purchase off your website. You just want to be sure you are providing the content on your website that they are searching for, build trust with them so they want to buy the product from you. If you just build a website quickly, don't put much information on it just put a couple of images on it and then information about the product you are selling, you may not make one sale.
Why would someone want to buy off you? Who are you? You need to put information on your site about the topic, put information about yourself as well (About Me Page) and start building an audience to get people to your site. Then if the information you are sharing on your website is valuable enough to people they will want your product and you will do very well.
I hope the information I shared helped you and gave you some ideas as to what niche you may want to use. Feel free to comment or ask me questions and I will do my best to help you.