Even if you are not a social person naturally or you don't like people you would have to force yourself into doing that because no business man succeeds without being able to connect with others. The purpose of starting up a business is to make money and there is no way you can achieve this if you don't do everything that you can to ensure that you make valuable connections with others. There is no business man you would come across that isn't social. As a business man you must learn good communication and socialization etiquettes.
According to your last words, I would like to ask some personal opinions, in my opinion, the first thing in business is to know your customer, (KYC) Know your customer, that is, know your customer first. Before investing in a business, you have to invest in yourself first, the more you invest in yourself, the more knowledge you will gain. In fact, to become a businessman, you have to have the mentality that no matter what happens, you will not lose your capital.
As the saying goes, the sweeter the better, that is, in business, you have to talk to your customers in such a way that they come back a second time. And the most important thing is that there should be no fake products, do not cheat people, if you can give people good things and good service, you will definitely become sustainable in any business.