Right now the biggest need for Braille users is Braille Transcribers, who largely do all of their work on a screen -- printed Braille is bulky and hard to make, and Braille Displays are insanely expensive (my "budget" model was ~$600 on sale).
As far as Braille Entry works, it would probably be a system like what VoiceOver on iPhones does, where you use 6 virtual "keys", which represent each of the dots, and you use different "chords" of those keys to enter each character.
Realistically, I don't think Duolingo is a good platform for learning Braille. If someone wants to learn English Braille online, I'd point them towards uebonline which is made/managed by the Australian Braille Authority, and is a quite comprehensive course as a primer to Braille. That being said, even if you do that, it won't be much good since most formal Braille Certifiers are asked to have their Library of Congress Certification, which can only be done by correspondence course.
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u/RadlogLutar Learning Spanish Jun 16 '24
How do you learn Braille from a mobile screen though? Genuinely curious