As far as teaching a layman who knows next to nothing a card trick, I definitely agree that we shouldn't be tipping double lifts or other very important moves to them, especially since the majority are unlikely to give the devotion necessary to do it well and are likely to perform it poorly when doing it for others, thus cluing the others into what, in my opinion, should be a well guarded secret. That is not good for us. Yes. I know that the double lift and other sleights can be found in multiple tutorials on YouTube, but there are many laymen (our potential audiences) who are still unfamiliar with these moves.
A good card trick to teach a layman who wants to learn a trick and an easy one for them to learn and perform (and one which surprisingly fools a lot of people) is the one where there is a secret prearrangement of two cards on the top of the deck, for example, the nine of hearts and the eight of diamonds. The magician goes through the deck and finds the nine of diamonds and the eight of hearts, and after briefly flashing those two cards (the nine of diamonds and the eight of hearts) to the spectator, the magician inserts them into different parts of the deck. The fingers are then snapped, the hand is waved, or whatever, and it shown that the two cards that were lost in the deck a moment before have magically risen to the top. Of course, they are not the same two cards, but because most people are not observant enough to catch the discrepancy, they will believe they are the same two cards they originally saw. I like to first perform it, then teach it. They will appreciate any trick more if it is one you have first fooled them with. It's a good trick. Try it sometime if you haven't done so.
