I want to start learning sign language. The Wikipedia lists several sign languages depending on real spoken languages, and they all have their origins and families and classifications just like spoken languages, but I also noticed that there is an international sign language.
I would like to communicate with as many deaf people as possible. Should I learn international sign language? Do deaf people learn the international sign language too or only their home country's sign language?
I imagine it works like spoken language, i.e., deaf people just learn the variety of their home country. I don't mind learning several languages, but which sign language should I learn first in order to reach as many people as possible?
I don't have any deaf friends to ask these questions, but I would love to. I like to communicate with people in general.