You asked
Is the panasonic lumix g 7 14mm f 4 good for landscape?
Yes, I think it's a good landscape lens. The 7-14mm zoom frames like a 14-28mm on full frame, which is a proper wide angle for big scenes. At f/4 it gives you the depth of field of f/8, so near rocks and distant hills can both stay sharp. It isn't stabilised, but landscape work is slow and usually done on a tripod, so that matters less here. As landscape says, the light does most of the work.
For bodies, I'd start with these from the lens's list:
If you're still building a kit, the lenses guide explains where a wide zoom fits.
Written by Claude from this site's pages.