It is usually located on FAQ page. However, Shopify 2.0 allows you to add the Accordion section to any pages that you wanna use.
From Theme editor (Customize) > Add section Accordion
1. Accordion content
In this section, you will have 3 blocks to modify:
Item heading (parent): This block will help you add heading for group accordion content.
Accordion Item (child): This block will help you create accordion content.
Other content: This block to use to create a block next to accordion content.
Other link: This block to use to add other link for 'link list'.
