You asked
Is the canon eos 250d worth buying used?
Yes, I think it's worth buying used. The EOS 250D page doesn't list a price, so I can't tell you whether it's a bargain today. But the logic in buying used applies: a body a generation or two old gives you most of the camera for less money, and cameras last. Check the battery before you commit, because old ones lose capacity. Budget for a new genuine one (batteries).
The 250D has no stabilisation in the body, so I'd lean on lenses with IS. For an everyday kit, the Canon EF-S 18-55mm f/4-5.6 IS STM is a sensible start. For wide landscapes, try the Canon EF-S 10-22mm f/3.5-4.5 USM. For wildlife or sport, the Canon EF 70-200mm f/4L IS USM is a strong choice.
Written by Claude from this site's pages.