earning

bussiness in partnership is not so easy task

yes. partnetship is good. because, it will 1. reduce risk 2. you may exchange experience btw you 3. if you already have customer and then he/she also have customer, by partnership, you can get advantages to get the customer you partner to buy your product and also for he/her. only that what i know

Personally, I don't think most partnerships work out, but I suppose if you have know the person for a very long time, you might have a chance. A business is very hard to run by yourself, as everyone must have the opportunity to get away for a while and have some sort of vacation. It won't be much of a vacation if you don't trust the partner you have. Especially if that person decides to steal. On the other hand, you would be forced to do everything yourself if you had no partner.