You asked
What are the alternatives to the canon rf 7 14mm f 2 8 3 5l fisheye stm?
I don't have a comparison of other lenses against this fisheye, so I can't name a true alternative from the site. What I can point you to is the Canon RF 7-14mm's own page, which lists every RF camera it fits, both full frame and APS-C.
If you want a wide lens for landscapes, start with the landscape guide. For general lens choices, Lenses covers a standard zoom and a fast prime as a first kit. The focal length converter will help you work out how a lens's aperture translates across sensor sizes.
Written by Claude from this site's pages.