Along with customizer options, we also provide custom widgets and widgetareas so that you can have more control over different sections on your site.
Go to Appearance > Widgets
Here you can find Widgetareas where you can add the widgets.
Each widgetarea has their own usage. Each widgetarea has their own description to help you figure out where they will appear in the website and its usage.
Note:** The options may vary from the screenshot.