Currency & paying
The south uses the euro, the north uses the Turkish lira — and that's less annoying than it sounds. Cards are accepted almost everywhere in the south; in the north, cards work in bigger places but cash is king in village cafés and market stalls, and most northern businesses will happily quote and accept euros at a fair-enough rate. ATMs are everywhere on both sides. My habit: pay by card in the south, keep some lira and small euro notes in the north, and never change money at the airport.