Swedish prepositions are small words with strong opinions. Especially i and på. You can live i Göteborg (“in Gothenburg”), but go on holiday på Gotland (“on Gotland”). You can shop i affären (“in the shop”), but work på banken (“at the bank”). You can walk i parken (“in the park”), but meet someone på torget (“in/at the square”). And sometimes both i and på work, as in i skolan and på skolan, but they do not mean quite the same thing.