Bootstrap Navigation

.navbar # base navbar class
.navbar-expand-lg # expand on large screens
.navbar-light # light navbar
.navbar-dark # dark navbar
.bg-light # background color

.navbar-brand # logo/brand text

.navbar-toggler # mobile menu toggle button
.navbar-toggler-icon # hamburger icon

.navbar-nav # navigation links container
.nav-item # navigation item
.nav-link # navigation link
.active # active link

.nav # base nav class
.nav-tabs # tabbed navigation
.nav-pills # pill-style navigation

.breadcrumb # breadcrumb navigation
.breadcrumb-item # breadcrumb item