Explanation

Box 1: DeployIfNotExists
DeployIfNotExists executes a template deployment when the condition is met.
Box 2: Template
The details property of the DeployIfNotExists effects has all the subproperties that define the related resources to match and the template deployment to execute.
Deployment [required]
This property should include the full template deployment as it would be passed to the Microsoft.Resources/deployment References:
https://docs.microsoft.com/en-us/azure/governance/policy/concepts/effects

Explanation
The Azure AD Privileged Identity Management (PIM) service also allows Privileged Role Administrators to make permanent admin role assignments.
References:
https://docs.microsoft.com/en-us/azure/active-directory/privileged-identity-management/pim-how-to-add-roleto-

Explanation

Step 1: Create an access review program
Step 2: Create an access review control
Step 3: Set Reviewers to Group owners
In the Reviewers section, select either one or more people to review all the users in scope. Or you can select to have the members review their own access. If the resource is a group, you can ask the group owners to review.

References:
https://docs.microsoft.com/en-us/azure/active-directory/governance/create-access-review
https://docs.microsoft.com/en-us/azure/active-directory/governance/manage-programs-controls

Explanation
To add an Azure firewall to a VNET, the VNET must first be configured with a subnet named AzureFirewallSubnet (if it doesn't already exist).
Configure VNET3.
* In the Azure portal, type Virtual Networks Virtual Networks from the search results then select VNET3. Alternatively, browse to in the left navigation pane.
* In the Overview section, note the Resource Group of the virtual network. We'll need these when we add the firewall.
* Click on Subnets.
* Click on + Subnet to add a new subnet.
* Enter AzureFirewallSubnet in the Name box. The subnet must be named AzureFirewallSubnet.
* Enter an appropriate IP range for the subnet in the Address range box.
* Click the OK button to create the subnet.
Add the Azure Firewall.
* In the settings of VNET3 click on Firewall.
* Click the Click here to add a new firewall link.
* The Resource group will default to the VNET3 resource group. Leave this default.
* Enter a name for the firewall in the Name box.
* In the Region box, select the same region as VNET3.
* In the Public IP address box, select an available public IP address if one exists, or click Add new to add a new public IP address.
* Click the Review + create button.
* Review the settings and click the Create button to create the firewall.
Reference:
https://docs.microsoft.com/en-us/azure/firewall/tutorial-firewall-deploy-portal

Reference:
https://docs.microsoft.com/en-us/azure/active-directory/manage-apps/manage-self-service-access