Does it seem daft wanting to learn sign language when I don’t know any deaf people?

I really want to learn it after watching “across the andes: beyond boundries”! But i dont really know any deaf people and i dont no if i ever will? I live in Britain Thanks for everyone who’s answering, they’re all reall great answers =] .

my grandparents own a motel and deaf people come in and i need to help them learn sign language?

i really need to help them learn this they keep losing and keep losing customers cause they need yo learn sign language i know it but im never there please help .