Audience targeting allows you to display different content to different audiences based on criteria such as profile, location, domain, or user. However, there are some limitations of audience targeting, such as:
You can't assign audiences to the components in the template header and footer sections. These sections are shared across all pages in your site and can't be customized for different audiences.
You can't assign record-based criteria to a component or branding set. Record-based criteria are only available for page variations and navigation menu items.

To make a Knowledge article visible to both authenticated customers and unauthenticated guest users on the public knowledge base, you need to select the Visible to Public Knowledge Base checkbox when creating the article. This will allow you to share the article with public users on your site. You can also select other visibility options, such as Visible to Customer or Visible to Partner, if you want to share the article with other channels.

To allow site users to tag site content with custom tags or member-created topics, you need to enable two permissions for site users in Setup:
Create Topics. This permission allows users to create new topics and assign them to content, such as posts, files, or articles. Users can also edit or delete the topics they created.
Member Can Access Topics. This permission allows users to access the topic management features on the site, such as viewing, following, or unfollowing topics. Users can also see the topics assigned to content and filter content by topics.

This license type allows third-party staff to access cases, leads, opportunities, contracts, and custom objects on behalf of UMS customers. Partner Community users can also create cases from questions, escalate questions to cases, and view Knowledge articles. Partner Community users cannot access quotes or reports and dashboards.

Two statements regarding data categories that are true are A and B. Data category visibility is controlled by roles, permission sets, or profiles. Child roles cannot see more data categories than their parent role, and if the parent role's visibility changes, the child role's category visibility is reset to match the parent's. Customer Portal users and partner portal users inherit data category visibility settings of the role assigned to their account (owner) managers by default, unless they have a custom profile that overrides the role settings.