Blackjack in five minutes
Blackjack is you against the dealer: get closer to 21 than the dealer without going over. Number cards count their number, faces count 10, and an ace counts 1 or 11.
A few habits go a long way. Stand on 17 or more. Hit 11 or less. With 12 to 16, stand when the dealer shows 2 to 6 and hit when they show 7 or higher.
Double on 11, and on 10 unless the dealer shows a 10 or an ace. Always split aces and eights; never split tens.
Play a Wednesday and every hand counts twice.