A lady in my class can only play by rhymes. These are her favorites:
(1) When the dummy is to your right, lead the weakest suit in sight.
(2) When the dummy is to your left, lead through heft.
(3) Don't be cute, lead partner's suit.
(4) The lead of top of three small is worst of all.
(5) The one who knows, goes.
(6) You will lose face if you underlead an ace.
Count your winners and count your losers. If the total doesn't come to 13, count your cards. (Sheinwold)