The $Record global variable allows you to reference the values of the active record the flow is running on.

Email-to-Case allows you to create cases from incoming emails. You need to enable this feature and set up routing addresses and case creation settings.

Contract is a standard object that represents a contractual agreement between your company and a customer. Case is a standard object that represents a customer's question or problem that needs to be resolved by your support team. Account is a standard object that represents an individual or an organization involved in your business, such as customers, competitors, partners, etc. These three objects are commonly used for service use cases in Salesforce. Reference: https://help.salesforce.com/s/articleView?id=sf.contract_fields.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.case_fields.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.account_fields.htm&type=5

A cross object formula field is a type of formula field that references fields from related objects using relationships such as lookup or master-detail. It can be used to display data from one object on another object without creating another relationship or copying data. A cross object formula field can be created on opportunity object to display data from industry field on account object using account ID lookup relationship. A custom account field, a standard account field, or a master-detail relationship field are not types of fields that can display data from industry field on account object on opportunity page layout; they either do not exist or do not reference related objects. Reference: https://help.salesforce.com/s/articleView?id=sf.cross_object_formulas.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.