If you are new to the Sony mirrorless system then you may not be aware that Sony makes two different types of E-mount lenses. Full-frame E-mount lenses (FE) which are designed for cameras like the full-frame Sony A7 series and the A9, and APS-C E-mount lenses designed for cameras with an APS-C sensor like the Sony a5000, a5100, a6000, a6300, a6400 and a6500.
Sony E-Mount Lens Guides
Third Party E-Mount Lens Guides
If you are only interested in third party Sony E-mount lenses, then the following guides should help.
Sigma E-mount Lenses