keyboard shortcut for highlight

Is there a shortcut to highlight and cancel highlight?
Thank you again. I LOVE scrivener.

It is Shift-Cmd-H. The menus are a pretty effective form of documentation for this sort of thing. Even if you don’t know where something is (in this case, Format/Highlight/Highlight Text, you can use the search tool in the Help menu to find menu commands and once you’ve found them the shortcut, if there is one, will be supplied to the right of the name.