She learned to sign into the hand of her teacher, Annie Sullivan. Hers is an amazing story and worth looking up. I believe the most famous media telling is the film/play The Miracle Worker (I prefer the 1960s version, but there have been others).

Have you honestly not heard of Helen Keller?

She used a braille typewriter and also a regular typewriter.

Braille, dictation, sign language, speech.

She also learned to speak, did lectures and tours with Annie Sullivan. She was a college graduate in an era when few women went to college and almost none who were severely disabled. There are some wonderful biographies and her own autobiography available in public libraries online.

She had a very good passionate teacher.

She learned how to write by feel, using a ruler to keep her lines straight.

Helen Keller used a regular typewriter or a braille typewriter to record her stories. Anne Sullivan helped edit and proofread her books over the years

Radio Lab actually just covered this https://pca.st/episode/ce2c0bb8-0a45-4fcc-a3ab-ef29805bfd4c

Her history is quite amazing and touching. Read more about her: https://en.wikipedia.org/wiki/Helen_Keller

Well, the book and movie Miracle Worker can answer part of that. She was a genius with caring parents and a patient, intrepid teacher. As an older child, after many years of living in a world in which she felt so confused, frustrated and isolated in, she was able to recollect what little experience she had with sound and language before she lost her sight and hearing when she was a toddler, and make a connection to the hand motions of the ASL alphabet, which her teacher would use, spelling words for Helen to feel with her own hands. After a lot of work on everyone's part, she made that amazing leap of understanding, and never seemed to want to stop leaning more. At first, she learned all her words via ASL finger spelling, and her communication abilities took off from there. Her story is amazing. I imagine what it must have been like to recover from an illness unable to see and hear..it must have been terrifying as a child, let alone as an adult.

She was one amazing lady. Well worth Googling

Quite a story. Look it up or watch movie. Helen Keller/ Ann Sullivan. Miracle Worker

I studied about her in my 8th grade course book that she was not born deaf and blind but it happend becuase of some illness when she was three . She knows sign language.she was amazing at feeling the things.

Blind people write using a system of dots called braille. And because she also couldn't hear people had to communicate with her using sign language, and because she couldn't see, this meant that you would have to sign into the palm of her hand. My mom is blind and my uncle is deaf so I've done a lot of research on Hellen Keller.

She had a VERY smart educator, Anne Sullivan Macy, who taught her American Sign Language, thereby opening the way to learning typing - first word Helen Keller learned was "water", feeling it flow over her hands, then Ms. Sullivan Macy signing water.

You really need to read her biography! The hurdles she overcame with her teacher Anne Sullivan are amazing! Can you imagine being cut off from both your sight and hearing? She was an amazing woman!

There were Braille typewriters. Still are.

She wrote using a braille machine. She read braille and signed as well.

There must be a hundred biographies of Hellen Keller. I suggest you read one if you want to learn about the details of her life. She gave public speeches, too. She may have been deaf but she had a voice heard around the world. She had a caretaker named Annie Sullivan whose story became the basis for the play and movie, The Miracle Worker. Patty Duke played Helen. Anne Bancroft played Annie.

Look her up. Her story and accomplishments are mind boggling

Read "The Miracle Worker". Helen not only learned to read, write & communicate, she graduated from college.

She learnd a sign language, there is a film based on this story. And through this she told someone the story wich then was written down.

Watch the old black & white movie with Patty Duke Austin portraying Hellen Keller, Duke Austin does a superb job as the persevering author, it's one of her finest works as an actor

She finger-spelled into a companion's hand.

https://www.newyorker.com/magazine/2003/06/16/what-helen-keller-saw#:~:text=She%20wrote%20not%20on%20paper,referent%20did%20mind%20break%20free.

She dictated and/or signed to her live-in helper.

I believe some of it was dictated through sign language to a sighted writer, some written with brail then translated, and i think she also learned how to type on a typewriter

You didn't learn about her in school?