IP address restrictions allow you to prevent users from accessing Salesforce from outside of their network. You can set IP address restrictions on the profile level or globally for the org. To enforce IP restrictions for API logins, you must select Enforce Login IP Ranges on Every Request in Session Settings.

A gauge component shows a single value along with its percentage of a total value within predefined ranges using colors (red-yellow-green). It is useful for showing key performance indicators (KPIs) such as total sales amount and progress towards sales goal. Reference: https://help.salesforce.com/s/articleView?id=sf.dashboards_gauge_component_type.htm&type=5

Web-to-Case and Email-to-Case are two solutions that allow customers to create cases from a web form or an email. Web-to-Case generates HTML code for a web form that you can place on your website. Email-to-Case converts incoming emails into cases.

Log in as the user is a feature that can be used to validate the error the user is receiving. Log in as the user allows an administrator to access Salesforce as another user and perform actions on their behalf, such as editing an opportunity. This can help troubleshoot issues that are specific to a user's profile, role, or permissions. Reference: https://help.salesforce.com/s/articleView?id=sf.admin_login.htm&type=5

Big Deal Alerts allow you to notify users when an opportunity reaches a certain amount or probability.