I have a coworker whose default mode of thinking is to manually type everything. He knows about things like tab completion and copy-paste, but for some reason those two things just aren't baked into his brain as a natural reflex like it is for most people. Like if he has to put a URL or database connection string in a config file somewhere, he'll start manually typing the string one character at a time, and will keep alt-tabbing between the config file he's editing and the email or whatever that has the reference string.
We found out that one of our co workers created tables of formulas in excel, then input a table in Word to manually type in and transfer over the table data. And of course the same formulas needed to be run through a desk calculator once more in case excel got that wrong the first time. Jaw dropping (when that person was shown about this magical copy/ paste feature, it was their jaw that dropped lol)
This is what training new folks looks like.
Even something as simple as a browser; watching someone click into the address bar and hit enter just to refresh the page, hurts my soul.