Explanation:

Step 1: In the Plug-in Registration tool, select Register New Assembly.
You use the Plug-in Registration tool (PRT) to register your plug-in assemblies and steps.
Registering an assembly is the process of uploading the assembly to the Dataverse database.
Step 2: In the Plug-in Registration tool, Select Register New Step,..PreOperation PreOperation occurs before the main system operation and within the database transaction.
If you want to change any values for an entity included in the message, you should do it here.
Step 3: In the Plug-in Registration tool, Select Register New Image, change the Image type to be a PreImage, and..
If your plug-in step is registered in the PreValidation or PreOperation stages of the execution pipeline, you could use the Organization service to retrieve the current value of the property, but this is not a good practice for performance. A better practice is to define a pre-entity image with your plug-in step registration.
Reference:
https://docs.microsoft.com/en-us/powerapps/developer/data-platform/register-plug-in

Explanation:

Box 1: Environment Maker
UserA must be able to create and publish Power Apps apps.
The Environment Maker role can create resources within an environment including apps, connections, custom connectors, gateways, and flows using Power Automate.
Box 2: System Administrator
UserB must be the owner of all the systems and be able to provide permissions and create all new environments.
The System Administrator has full permission to customize the system. Can view all data in the system.
Box 3: System Customizer
UserC must be able to create apps connected to the systems and update the security roles and entities.
The System Customizer has full permission to customize the system. Can only view rows for system tables that they create.
The difference between the System Administrator and System Customizer security roles is that a system administrator has read privileges on most rows in the system and can see everything. Assign the System Customizer role to someone who needs to perform customization tasks but shouldn't see any data in the system tables.
Box 4: Common Data Service User
To stay consistent with our product rebranding effort, the security role Common Data Service User is being changed to Basic User.
The Basic User security role primarily contains Basic privileges for core entities where the user can write, update, and delete records that they created or owned.
Reference:
https://docs.microsoft.com/en-us/power-platform/admin/environments-overview
https://docs.microsoft.com/en-us/powerapps/maker/model-driven-apps/privileges-required-customization - system-administrator-and-system-customizer-security-roles
https://docs.microsoft.com/en-us/powerapps/maker/model-driven-apps/privileges-required- customization#system-administrator-and-system-customizer-security-roles
https://docs.microsoft.com/en-us/power-platform-release-plan/2020wave2/data-platform/common-data- service-user-security-role-renamed-basic-user
https://docs.microsoft.com/en-us/power-platform-release-plan/2020wave2/data-platform/common-data- service-user-security-role-renamed-basic-user

Visual representation of metadata can be useful, especially when you are trying to describe the relationship between entities in the system. You can use the Metadata Diagram sample code provided for Dynamics 365 Customer Engagement (on-premises) to generate the entity relationship diagrams.
You can create a diagram that shows a relationship for just one entity, or a complex diagram that includes dozens of related entities, including custom and system entities.
Reference:
https://docs.microsoft.com/en-us/dynamics365/customerengagement/on-premises/developer/use-metadata-generate-entity-diagrams

Conditional formatting in Power Apps can be done with formulas.
Reference:
https://powerapps.microsoft.com/en-us/blog/conditional-formatting-in-powerapps/