Explanation
To see certain information about one or more cases when referencing the contact record, an administrator can use two methods: edit the Related List component in the Lightning App Builder and choose Related List as the related listtype; and use the page layout editor to include the appropriate column in the Cases related list. The Related List component is a component that allows users to view and edit records related to a parent record on a record page. The Related List component has two types: Related List and Enhanced List. The Related List type shows records in a table format with columns that match the page layout of the parent record. The Enhanced List type shows records in a compact format with fewer columns and actions. To change the type of the Related List component, an administrator can use the Lightning App Builder and select either Related List or Enhanced List from the properties panel. The page layout editor is a tool that allows administrators to control how fields, related lists, buttons, etc., are arranged on a record detail or edit page for each object. To include appropriate columns in a related list, such as case name, case ID, customer name, case reason, case status, and case creation date for cases related to contacts, an administrator can use the page layout editor and drag and drop the desired fields from the palette to the Cases related list on the contact page layout.
References:
https://help.salesforce.com/s/articleView?id=sf.lex_related_lists_component.htm&type=5https://help.salesforce.c

Explanation
One of the possible reasons why an administrator is unable to add a new user in Salesforce is that the username is already in use by another user in any Salesforce org. Usernames must be globally unique across all Salesforce orgs, so the administrator needs to choose a different username for the new user.
References:https://help.salesforce.com/s/articleView?id=sf.users_add.htm&type=5

Explanation
Bucket column allows you to categorize report data into groups without creating a formula or custom field.
You can create buckets for different ranges of values and assign labels to them.
References:https://help.salesforce.com/s/articleView?id=sf.reports_bucketing_overview.htm&type=5

Explanation
A roll-up summary field is a type of field that calculates values from related records, such as the count of child records or the sum of a field on child records. In this case, the administrator can add a roll-up summary field to the open house object to track the number of visitors by counting the child records on the visitors object.
References:
https://help.salesforce.com/s/articleView?id=sf.fields_about_roll_up_summary_fields.htm&type=5

Explanation
A PriceBook is a feature that allows administrators to define different prices for the same products based on different criteria such as customer segment, region, channel, etc. For example, a PriceBook can provide reseller partners with discounted prices on the products they purchase compared to regular customers. A PriceBook consists of one or more PriceBook entries that specify the product ID, pricebook ID, list price, currency, and active status for each product-pricebook combination.
References:https://help.salesforce.com/s/articleView?id=sf.pricebook_overview.htm&type=5