There are multiple theme functionalities that you can develop or implement in theme. For example, Sidebar & Widgets, Navigation Menus, Featured Images & Thumbnails etc.
Explore these videos for insights and tutorials on Theme Functionality. This section comprises 3 modules with a combined duration of 44 minutes.
|Theme Functionality Overview||15:11|
|Theme Support and Nav Menus||17:38|
|More on Theme Functionality||10:18|
Go through Theme Functionality handbook page to learn more about various theme functionalities.