How’d deaf people learn to read, they neeed to hear the sounding of each letters to be able to read a word?

go watch the Hellen Keller Movie it will give you a good insight into how a deaf person can learn to read and such...

they look at the lips alongside the material. It's why deaf people speak not quite right, they only know a mouth shape and they create a sound. They can't hear so they can't fine tune speech

You can search the question on Google.