Similar to what the other two said.

You need to identify people’s problems, needs, desires and wants.

Go to google trends... type a bunch of stuff you think people want or need.

For example (Dog Collars)

Type that in google trends. See if you think there is a demand in this. If so, great. Perhaps you can start a Shopify store (plenty of YouTube tutorials or even knowledge from me) and create a brand around dog collars and products. Perhaps do YouTube reviews on them and leave affiliate links.

Or if you don’t have ANY money, sell what you really don’t need. If you don’t use it every day. Consider selling it.

So...

....Identify a problem, and offer a solution (your product)