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To open a buffer in a vertical split, you can use the word "vert". For example :
:vert term #it opens a terminal in a vertical split
:vert sb1 #it opens the buffer 1 in a vertical split
Why i can't make the vert command shorter ?
On internet, i saw that people just write :
:vterm
:vsb1
For me it doesn't work...
The full :vert is :vertical and the full :term is :terminal. In order to save typing, Vim lets you type as few characters as possible as long as there is no ambiguity so, for :vertical, you could type:
:vertical
:vertica
:vertic
:verti
:vert
but you can't go further because there are three commands that start with ver:
:vertical
:version
:verbose
and Vim can't really be expected to guess which one you want. Therefore, :vert is the shortest you can get.
The mechanism is described in chapter 20 of the user manual: :help 20.2.
Now… those people on the internet are probably using or trying to use abbreviations, which are introduced in chapter 24 of the user manual: :help 24.7 and thoroughly documented under :help abbreviations.
:substitute has been around since ed, so for backwards compatibility the shorthand :s needs to be :substitute. But as pointed out, :sb is the shorthand for :sbuffer (though I would guess that :sb1b would be interpreted the same as :s/1/; that is, delete the first 1 in the line or error)