I got the entrepreneur bug when I was a wee child (18) selling brand new her-styler flat irons and Milani makeup products that I got at a sketchy ass ware-house in Los Angeles for pennies. ( overstock but not sold publicly ) (girlfriend at the time) now wife is Mexican that's how I got the connect (hehe) ended up grossing 400 per day at 18. Not bad. Then the companies found their products online and that was that. Made dumb money though around 20k a month at one point selling $200 dollar straighteners for $50 bucks, bought them for $12.00.
The makeup was sold as wholesale to me, and I resold for higher wholesale prices. Bought a box of Milani nail polish with 200 pieces for $60, sold each box for $180 + 40 dollar shipping since they were heavy as fuck. The same thing happened with that company. I recently caught the bug again now that I am retired and have plenty of time to get well versed in glassware/clothing/women's handbags / last but not least jewelry, not just real jewelry but costume as-well. Big money with some brands. 99% of people overlook costume jewelry and regular old jeans but some Levi's can go for hundreds if not thousands of doll hairs.
Now my new venture is buying and resell expired domains on the side for fun, I own around 60 domains, eBay is surprisingly a good place to sell domains. Put them up at a decent price with a or best offer option, you'll get offers. I accept most offers if I triple my money, but every domain I have ever bought and resold has been 100% profit. Buy on expireddomains.net for 8-10 bucks, slap them on dan.com afternic, sedo and ebay. if the domains make sense they'll sell.
That's just a taste of what I do on the side for fun and money. Now i'm going to start reselling books (I live near a college town, textbooks everywhere) and brand name CVR's and cassette players.
one last thing if you have a space to do it, buy real wood dressers, sand and paint them, maybe put new hardware on them, flip for an easy profit. slap a coat of paint on any sort of furniture that is decent quality and it will sell. Facebook market place, offerup, any reseller app.

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hope this helps!
edit: also one tip if you want to get into the thrifting reselling business, always go to church based thrift stores, all the nice little old ladies in there are volunteers. Give them your number talk to them and ask them to call you whenever certain items you are looking for gets donated (jewelry) to the store. They usually call if you end up buying a lot.
