To find out how current and popular a topic is, site users can go to the topic's detail page. The topic's detail page shows information such as the number of followers, the number of posts, and the last activity date of the topic. Site users can also see the related topics and subtopics, as well as filter the content by type or time range.

Three topic types that can be used in an Aura site are:
Standard Topic. This is a topic that is created by users or administrators and assigned to content, such as posts, files, or articles. Users can follow or unfollow standard topics and see the related content on the topic detail page.
Featured Topic. This is a topic that is selected by administrators to highlight important or popular content on the site. Featured topics appear on the home page or on the topic catalog page of the site.
Navigational Topic. This is a topic that is used to organize content into categories or subcategories on the site. Navigational topics appear on the navigation menu of the site and allow users to browse content by topic.

Reputation is a feature that allows you to reward community members for their contributions and engagement.
When you enable reputation for your community, some things happen automatically, such as:
* Inactive and active members are assigned default reputation points. Inactive members get zero points, while active members get 10 points.
* Default point system and set of reputation levels become available. You can use the default point system or customize it to suit your needs. You can also use the default reputation levels or create your own.

Page variations allow you to create different versions of a page for different audiences. You can use the flexible page layout to customize the components and layout of each page variation. You can also target each page variation to a specific audience based on criteria such as location, profile, or record type.

ExperienceBundle is a feature that allows you to retrieve, deploy, create, update, or delete an Experience Cloud site's metadata definition in a single API call. Some of the key features of ExperienceBundle are:
ExperienceBundle enables creating experiences across orgs. You can use ExperienceBundle to move your site's metadata from one org to another, such as from sandbox to production.
ExperienceBundle provides editable community metadata in a human-readable format. You can use ExperienceBundle to edit your site's metadata in JSON or XML format, which makes it easier to understand and modify.