I can understand trying to teach someone via visuals or by talking to them but I can’t figure out how you would teach someone multiplication or about government services or scammers without either.
Teach them tactile signs and go from there.
Watch The Miracle Worker for a notable famous example.
Helen Keller naturally came to my mind as well. She was not born blind and deaf though. She lost those sense at 19 months, so about a year and a half in. That is still quite young, but enough to establish the basis for things like object permanence and 3 dimensional space. In the climatic scene of The Miracle Worker, the main character says a word she learned as a baby, underscoring the importance of her early months.
To truly be born deaf and blind I think would be another degree more challenging.
I think the first step is generally establishing communication first. Like they might learn signs by touch. Later they could be taught braille in order to read.
How would they learn any language, there is no one who can explain to them the meaning of the words?
There is no one
Why make such claim? It’s really a stretch to assume the individual lives in a social bubble by themself.
That being said, the same way you were taught your language(s); consistency.
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Touch based communication is a thing that exists. Some cultures count based on where they touch, for example, not by showing some number of fingers. The basics, however, involve consistency in the language taught. While there is no common, to my knowledge, touch based language it is possible for the basics of communication to be performed through touch alone and as long as the language was consistently used the individual would be able to learn it the same as sign language or spoken language. From that point it would be possible to bootstrap braille, and from there a more complex language model.
That’s true for all of us. We work it out from context and eventually become fluent in whatever language(s) we are exposed to.
A lot of times there are degrees of deafness or blindness. But one way to communicate is via touch: https://www.youtube.com/watch?v=9GrK3P15TYU
