Can I adapt old lenses to l mount?

Here is what the site says about that.

From Lenses: Adapters: Mirrorless mounts are shallow, so old manual-focus lenses from film cameras adapt easily and cheaply. It's a fun way to try fast or unusual lenses, without autofocus.

From L-Mount: L-Mount: An alliance mount: Leica, Panasonic and Sigma bodies and lenses all fit each other. Sigma's MC-21 adapts Canon EF lenses with autofocus.

Quoted from this site's pages.