How do we build Trust before building a Business ?

How did Mr. Nikhil Kamat build trust with his customer before building Zerodha business "?
Thank you

Let me state the obvious - The best way to build trust is to actually be trustworthy, even when it is a lil inconvenient to be so. When you display that you can be trusted in trying times, it often shows, and the compounding positive effect it can have is immense.