flipped a handful over the years, mostly stuff i grabbed cheap on expired drops. the money is real but its way more about patience than picking clever names. i held a couple for like 3 years before anyone bit, and a few i just renewed forever and never sold.
what actually moved for me was domains that already had some backlink history or matched a niche keyword people search with buying intent. brandables sell too but the market is flooded so you need volume and a marketplace presence.
honestly the biggest mistake i made early was overpaying at auction thinking i found gold. you make money on the buy not the sale. set a hard max and walk away, theres always another drop tomorrow.
one thing nobody mentions, taxes and fees eat into it more than you'd think, and a lot of the "sold for $X" screenshots floating around are gross not net. just keep expectations realistic, its a slow grind not a quick flip for most people.