most accessible editor

[Linux for blind general discussion]

emacs is available.  It has a tutorial to run to learn it.  There is also
emacspeak that can turn emacs into a talking linux environment for those
that will use it.  Best to learn emacs first then move onto emacspeak
since that'll be another learning curve.  Both of these have learning
curves but the reason to learn at least one or both is the extra
extensions that can be installed on them to get all manner of work done
you can't do with nano or vi or pico.
Nano is supposed to be an improved successor to pico with more features.
The vi editor is peculiar and unique in that when you start it up it's in
command mode and you toggle between command mode and input mode using the
escape key.  Not the case with the other editors mentioned.  Command mode
can be a highly dangerous place to be especially for a new vi user when
starting out.
The emacs editor/platform has its own help list any subscriber can write
and ask questions and get pointed to web pages or documentation already on
their system.  Slint already has emacs and info installed and typing info
emacs gets you into that documentation.  A couple other info commands to
try are info info, info erc, info org, info forms, info eww, and info
newsticker.  All of this runs out of emacs; once emacs is started these
other commands can be run.
In emacs you start out in input mode if you open a file with it.