These are two Service Cloud features that work together to improve the process of closing a case and sending a survey through email. Macros are tools that allow agents to automate common or repetitive tasks on a record, such as sending an email or updating a field. Macros can help agents save time and avoid errors when closing a case and sending a survey through email. Email Templates are tools that allow administrators to create predefined email messages that can be used for common purposes, such as sending surveys or confirmations. Email Templates can help ensure consistent and professional communication with customers.
Verified References: : https://help.salesforce.com/s/articleView?id=sf.console2_macros_overview.
htm&type=5 : https://help.salesforce.com/s/articleView?id=sf.email_templates_overview.htm&type=5

Setting up a sharing set to grant access based on the community member's contact record is a solution that can implement the requirement of enabling community members to access, create, and manage cases online. A sharing set is a feature that allows administrators to grant access to records for community users based on their user profile and a common field on the user and parent records, such as the contact or account fields. A sharing set can help ensure that community members can only see and edit their own cases or cases related to their contact or account. Verified References: : https://help.salesforce.com/s/articleView?id=sf.
networks_sharing_set.htm&type=5 : https://help.salesforce.com/s/articleView?id=sf.
networks_sharing_set_create.htm&type=5

Partner Community Login is an Experience Cloud license that allows external users such as partners or resellers to access Salesforce features such as reports, dashboards, leads, opportunities, etc. This license also allows external users to run reports as specified users, which means they can see report results based on another user's data access level. This license meets the requirements of external support managers who need to view and execute reports with this ability. Verified References: [Experience Cloud User Licenses]

Knowledge Only User is the recommended license for the specialists who will create and manage knowledge articles in Salesforce. Knowledge Only User is a user license that allows users to access and use Salesforce Knowledge, but not other standard Salesforce objects or features. Knowledge Only User is a cost-effective license for users who only need to work with knowledge articles. Verified References: : https://help.salesforce.
com/s/articleView?id=sf.users_license_types_available.htm&type=5 : https://help.salesforce.com/s
/articleView?id=sf.users_license_types_knowledge.htm&type=5

Case assignment rules are rules that automatically assign cases to users or queues based on certain criteria.
You can create a case assignment rule to ensure that cases are owned by a user when they are closed, by setting the criteria to match the closed case status and the action to assign the case to the user who last modified it. This way, you can prevent cases from being closed while still owned by a queue. To correct the existing problem of hundreds of cases that are closed but still owned by a queue, you can use a data tool such as Data Loader or Import Wizard to update the owner field on those cases in bulk. Verified References: [Case Assignment Rules] and [Data Tools]