You asked
Is the sony fe 12 24mm f 2 8 gm worth buying used?
I can't tell you whether this lens is a bargain at any particular price, because the site doesn't list prices. What I can say is that it's a full frame wide zoom, 12-24mm at f/2.8, with autofocus. It isn't stabilised, so it leans on good light or a fast shutter speed. It fits a long list of Sony E bodies, from the a7 up to the a1 II, and also works on APS-C, where it frames like 18-36mm.
Buying used is a sensible way to get gear like this. Check the seller's asking price against the lens's current used market before you pay. And budget for a new genuine battery with any used body, since old batteries lose capacity. For the wider picture, see buying used.
Written by Claude from this site's pages.