I never show them the training videos, barely tell them about brewed coffee, and usually don't even show them the training materials or barista certification stuff at all. None of that helps you very much during a shift. I want them to be able to sequence two flavored lattes within 10-15 minutes of the start of their first shift - that way, they can help guests (with supervision) almost immediately, so they don't waste time just watching me help guests. I hate how they have to just step aside and let me help guests at first.
I might show them the 3 training block things and sign off on the certifications when I open my new store this summer, though. We'll see.