A good TH4 layout for new players
At Town Hall 4 most attacks use Barbarians, Archers, Giants and Goblins. Simple layouts work well: keep the Town Hall and storages behind walls, place the Mortar where Archer Towers and Cannons cover it, and keep the first Air Defense away from the edge.
Because many TH4 players are new to the game, the layouts here are labelled with their intent so you can choose between protecting resources and protecting trophies.