If I open a store on Amazon, can I really make a lot of money?

I’m hearing a lot of people recommend opening a store on Amazon

And everyone tells me that the opportunity to make a lot of money is a great opportunity

But all of them already have e-commerce courses

I want to listen to people who have real experience and listen to their advice, and have transparency to tell me their experience and advice.

What is the approximate start-up capital? Is it really profitable?

Thanks in advance