syntax question

[molleweide]

I man pages it shows this:

  General Syntax
       yabai -m window [<WINDOW_SEL>] <COMMAND>

   COMMAND
       --focus <WINDOW_SEL>
           Focus the given window.

and I notice that most people write commands like this yabai -m window --space next but from what I understand it is also
possible to write this: yabai -m window --window next --toggle border or --window next --focus next. (Even though the latter one doesn't make any sense I think.)

Also, I do believe that I am just missunderstanding something here because I cannot find any skhdrc files that write commands like in my examples above.

I think what confuses me is that the window selection is presented as optional before command in general syntax and then another window selection comes after the command.