Hmm, older people have done that for sure.
So probably most entrepreneurs before the internet was a thing.
It was the same thing. Just put it in front of people who might be interested and otherwise wouldn't be able to find it, but they wanted it.
Easiest would be to search for 2nd hand items and sell them on a bazaar at some margin.
A lot of people import from aliexpress / buy in bulk and resell on bazaar.
Now, few people sell quality items. If you can provide quality and have useful items, probably customers will come back.