I want to start a small business in kolkata ,invest 5 lakh ,i want 20% per manth friends you have any ideas share with me

If it was as simple as telling you what to do, don't you think everyone would do this?

We don't know the area you're planning on starting a business in, we have no idea what a "lakh" is, and if I had a great idea for a business, I'd be doing it.

This is something you have to research, you can't expect others to do that research for you. The first step is finding out what's needed in this area, what sort of product or business would thrive, and then doing your due diligence.

If you're not willing to put in the time and effort before you start a business, you won't put in the time and effort a new business will need once it's started. Time to put in the work.