I recently read an article, where Google claims 90% of us don't know about the Ctrl + F short cut is. Including office admin
One University of Syndey associate claimed Google should teach that stuff on their site. I see a lot of potential for DuckDuckGo to beat google to it. I'm not a developer or anything yet but maybe they could show a bubble telling them shortcuts to use, right next to the search box.
Like in this photo? Maybe it's a start.