Explanation
Knowledge articles are documents that provide information or solutions about products, services, or processes in Salesforce. You can use knowledge articles to respond to customers quickly and consistently with accurate information. You can create different types of articles with different templates and fields, such as FAQ articles, troubleshooting articles, how-to articles, etc. To meet the requirement of responding to customers with the top five troubleshooting tips that could help solve their issue, you need to create knowledge articles with those tips and attach them to your email responses or case comments. References:
https://help.salesforce.com/s/articleView?id=sf.knowledge_article_types.htm&type=5

Explanation
Compact layouts determine which fields appear in the highlights panel on record pages and in the Salesforce mobile app. To create a custom compact layout, go to the Account object manager and select Compact Layouts from the sidebar menu. Then click New and add the desired fields to the layout. References:
https://help.salesforce.com/s/articleView?id=sf.compact_layouts_create.htm&type=5

Explanation
Assignment rules and queue configuration are two options that should be used to help the support team work on some of UC's cases. Assignment rules can be used to automatically assign cases to a queue based on certain criteria, such as case origin or priority. Queue configuration can be used to add Case as an available object to the existing queue and specify which users or groups can access the queue. References:
https://help.salesforce.com/s/articleView?id=sf.case_assignment_rules.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.customize_queues.htm&type=5

Explanation
App page and record page are two types of pages that an administrator can build and customize using Lightning App Builder for Salesforce mobile app. App pages are pages that display information or tools that don't belong to a specific record; they can be accessed from navigation menus or tabs in Salesforce mobile app. Record pages are pages that display information or actions related to a specific record; they can be accessed by opening any record in Salesforce mobile app. User page and dashboard page are not types of pages that can be built using Lightning App Builder for Salesforce mobile app; they are types of pages that can be built using other tools such as Profile settings or Dashboard Builder. References:
https://help.salesforce.com/s/articleView?id=sf.app_builder_mobile_pages.htm&type=5