Dear Santanu do you really believe that Hindi speaking people can not do business or can not learn from you or might not be interested in your procast so neither of it is true so please think about it.
Learn English, there are absolutely negligible Hindi resources for tech, coding or engineering. Have you ever read a Hindi engineering book ? What happened to the Hindi engineering course in Bhopal, it failed miserably. This is such a silly argument these days, like it or not, almost 90% of technical books are in English. The Chinese have started learning from 2000's