Theme Functionality with functions.php

Adding Theme Features

Customizing WordPress Behavior

Loading Order and Execution

Creating a Setup Function

Hooking into after_setup_theme

Best Practices for Setup Functions

Post Thumbnails

Automatic Feed Links

Title Tag

Post Formats

HTML5 Markup

Custom Logo

Custom Header

Custom Background

Selective Refresh for Widgets

Wide Alignment

Responsive Embeds

The wp_enqueue_scripts Hook

wp_enqueue_style() Function

wp_enqueue_script() Function

Managing Dependencies

Versioning Assets

Loading Scripts in Footer

Conditional Loading

Dequeuing Styles and Scripts

register_nav_menus() Function

Displaying Menus with wp_nav_menu()

Custom Menu Walkers

Menu Fallbacks

register_sidebar() Function

Displaying Widgets with dynamic_sidebar()

Customizing Widget Markup

Multiple Widget Areas

Helper Functions

Content Filters

Action Hooks