> Latin-1 is a reasonable general-purpose default, whereas ISO-8859-8
   > isn't.

Well for me most likely yes, for the friend of mine, who is reading
mostly english and hebrew, may 8859-8 might be  reasonable.

   > Yes.


   > set-coding-system-priority (but you really should learn to read the
   > manual, so you could answer these questions yourself).

This is what I thought but it is not an interactive function. I thought
I could do it via customize, but I cannot.
This is the documentation
,----
| 
| set-coding-system-priority is a built-in function in ‘C source code’.
| 
| (set-coding-system-priority &rest coding-systems)
| 
| Assign higher priority to the coding systems given as arguments.
| If multiple coding systems belong to the same category,
| all but the first one are ignored.
`----

And this 
(set-coding-system-priority (utf-8 iso-2022-7bit iso-latin-1 iso-2022-7bit-lock iso-2022-8bit-ss2 emacs-mule raw-text iso-2022-jp in-is13194-devanagari chinese-iso-8bit utf-8-auto utf-8-with-signature))

(set-coding-system-priority '(utf-8 iso-2022-7bit iso-latin-1
iso-2022-7bit-lock iso-2022-8bit-ss2 emacs-mule raw-text iso-2022-jp
in-is13194-devanagari chinese-iso-8bit utf-8-auto utf-8-with-signature))

Does not work. Sorry but the documentation is not helpful, at least not
for me.

Also not 
https://www.gnu.org/software/emacs/manual/html_node/elisp/Specifying-Coding-Systems.html