That is right. It is only through research that you find out if a business is great or not. Also, you cannot rely on the fact that someone else was successful in the business and so you think it is a profitable thing. You have to try it yourself to see if it works for you.A lot of business looks profitable but when you start doing it only then you will find if whether it is profitable or not. In order to avoid doing that mistake, you should do ma lot of research about the business including your competitors.