Explanation
According to the Palo Alto Networks Compatibility Matrix , the three platforms that support PAN-OS 10.2 are:
PA-800 Series2
PA-2202
PA-3400 Series2
The PA-5000 Series and PA-500 do not support PAN-OS 10.2
To upgrade devices to PAN-OS 10.2 using Panorama, you need to determine the upgrade path3, upgrade Panorama itself4, and then upgrade the firewalls using Panorama

Explanation
Because GlobalProtect users must authenticate to gain access to the network, the IP address-to-username mapping is explicitly known. This is the best solution in sensitive environments where you must be certain of who a user is in order to allow access to an application or service.
https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-admin/user-id/user-id-concepts/user-mapping/globalprote

Explanation
If the HA status is showing as down after enabling HA Heartbeat Backup on two devices, an administrator could troubleshoot the issue by checking the peer IP address in the permit list in Device > Setup > Management > Interfaces > Management Interface Settings. This is described in the Palo Alto Networks PCNSE Study Guide in Chapter 7: High Availability, under the section "Configure Heartbeat Backup for Redundancy":
"Verify that the management interface's permitted IP addresses on each peer includes the IP address of the other peer's Heartbeat Backup interface."

Explanation
When deploying SSL Forward Proxy decryption, a forward trust certificate must have a subject alternative name (SAN) and be a server certificate. SAN is an extension to the X.509 standard that allows multiple domain names to be protected by a single SSL/TLS certificate. It is used to identify the domain names or IP addresses that the certificate should be valid for. A private key is also required but it is not mentioned in the options. A certificate authority (CA) certificate is not required as the forward trust certificate itself is a CA certificate.

Explanation
The Best Practice Assessment (BPA) tool compares the configuration of firewalls and Panorama to the Palo Alto Networks best practice recommendations. Run the BPA periodically to identify security weaknesses, see the best practice settings, and implement them to improve your security posture.
https://docs.paloaltonetworks.com/best-practices/10-2/bpa-getting-started