Layout namespacing

This course follows how a Rails app decides which layout wraps each page. Public pages render inside application.html.erb, and every page under /admin renders inside admin.html.erb. The switch is one line, layout "admin", in Admin::BaseController. The lessons read the installed ActionView::Layouts source to show how nested Admin:: controllers inherit that value through class_attribute. They also show how controllers with no layout call fall back to application.html.erb by convention. Finally, they compare both layout files line by line and cover the Symbol, Proc and render layout: false forms.