what is `get_section()` and how to use it?

If you check the code reference entry for get_section(), you can see its description:

Retrieve a customize section.

“customize” means the customizer, the theme handbook has a complete chapter for using the customizer API, and one paragraph explaining sections:

Sections are UI containers for Customizer controls. While you can add custom controls to the core sections, if you have more than a few options you may want to add one or more custom sections. Use the add_section method of the WP_Customize_Manager object to add a new section:

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