>>82264243 (OP)
i go to thrift stores, find sellable goods, buy them and sell them online. you have to do it for a little to build an inventory as the return per thing is not much, and you also have to work out which thrift stores near you are worth checking.
ive made a living this way since leaving college...mostly on clothes. the year that covid lockdowns were happening i made 120k cause everyone was shopping online.
clothes take a lot of experience to do anything but obvious vintage sweatshirts which are easy but rare...recognizing vintage womens stuff or other womenswear thats worth money is harder...and also you have to be willing to go through the womens sections lol. another good thing about clothes is theyre easy to ship unlike say decorative plates.
but one easy thing you can do right now is, if theres a thrift store with 99c books and theres a lot of them, you can get an app on your phone that scans the ISBN and looks up the value. anything thats $10 or over, you buy and put up on amazon books or ebay. usps media mail makes shipping books, tapes, cds etc always cheap.
this isnt going to be an instant turnaround -- any given thing you put up may take months or years to sell, BUT the acquisition costs are so low that you just keep building your inventory until the trickles add up.
all you need for this is some storage space and a little starting money for thrift shopping...but as i said ive done it for like 10 yrs now and its pretty reliable over time though there are seasonal ups and downs in earnings. i did it on the bus originally too, coming back with bags of clothes from the goodwill outlet probably lookin like a hobo lel.