Does it actually work?

At work I had to go into someone's basement and it was stacked floor to ceiling with new stuff from dollar general and target. Tons of water, cleaning supplies, paper plates, just good consumables. The guy said his wife does the crazy coupon lady stuff and most of it is free or just pennies on the dollar. I checked out her app and FB and it all seems like scammy AI posts, courses and BS. Do any of you do this? Not getting expensive stuff just daily use stuff at a really good markdown consistently? Thanks