Explanation
Standard objects are objects that are included with Salesforce by default, such as Account, Contact, Lead, Opportunity, etc.They have predefined fields and functionality that support common business processes.
Custom objects are objects that you create to store information that is specific to your organization or industry.
You can create new standard objects using the Object Manager in Setup.
References:https://trailhead.salesforce.com/en/content/learn/modules/data_modeling/standard_and_custom_obje

Explanation
To ensure extra steps only appear when creating open house records for condominiums, an administrator can use two methods: create two page layouts; and use business processes and record types to display appropriate picklist values. A page layout is a feature that allows administrators to control how fields, related lists, buttons, etc., are arranged on a record detail or edit page for each object. An administrator can create two page layouts for open house records - one for houses and one for condominiums - and include different fields or sections for each page layout based on their requirements. A business process is a feature that allows administrators to define and enforce stages that records must go through based on their record type such as lead status or opportunity stage. A record type is a feature that allows administrators to offer different business processes, picklist values, page layouts etc., to different users based on their profile or role. An administrator can create two record types for open house records - one for houses and one for condominiums - and assign different business processes and picklist values for each record type based on their requirements. References:
https://help.salesforce.com/s/articleView?id=sf.customize_pagelayouts_overview.htm&type=5https://help.salesf

in to Salesforce.

Explanation
Flow Builder supports creating a screen that can launch a simple discount calculator when a button is clicked on an opportunity.
References: https://help.salesforce.com/s/articleView?id=sf.flow_builder_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.flow_distribute_button.htm&type=5

Explanation
Custom object and master detail field are two steps that should be configured to meet this requirement.
Custom object can be used to create a new object for shoe design that can store information about different designs and stages. Master detail field can be used to create a relationship between Product and Shoe Design that prevents deletion of Shoe Design records and allows multiple designs for one product. References:
https://help.salesforce.com/s/articleView?id=sf.customize_customobjects.htm&type=5https://help.salesforce.com