What most schools don't teach

Trying to remember the first thing I coded... it think it was printing out coloured squares or a goto loop on an Apple II. First thing I was proud of was an app to calculate the minimum number of ladder moves to populate the marquee at the Metro Cinema on Broadway (closed in 2005 but I changed the marquee from 1983 to 1985) given a fixed/known number of plastic letters and missing characters...