Classic Vanilla Buttercream Frosted Cake

Name: Classic Vanilla Buttercream Frosted Cake
Cuisine: American
Ingredients: Room temperature are crucial; Crumb coat before final frosting; 3 cups all-purpose flour; 2 1/2 teaspoons baking powder; 1/2 teaspoon salt; 1 cup unsalted butter, room temperature; 2 cups granulated sugar; 4 large eggs, room temperature; 2 teaspoons pure vanilla extract; 1 1/4 cups whole milk, room temperature; For the Buttercream Frosting; 1 1/2 cups unsalted butter, room temperature; 6 cups powdered sugar; 1/3 cup heavy cream; 2 teaspoons pure vanilla extract; 1/4 teaspoon salt; Apply thin crumb coat; Decorate as desired; Use different extracts in frosting; Add food coloring for themed cakes; Pipe rosettes around top edge; Measure flour correctly (spoon and level)