I work in a Helpdesk. I have callers who do not know where the start button or the taskbar are located despite me telling them where to look : )
How many times have you uttered the words, “double click any tab and the ribbon will come back?” Or, “the tab is the thing at the top of your screen that says HOME on it... It’s gray...?”
Or how about, “Don’t type the word enter, press the key labeled enter... Let go of the key.”