Need to state the importances of troubleshooting your device.

Have a record of all hardware so you know what your estate looks like
Have a record of all installed software to ensure it is properly patched/updated
Utilize secure configuration / hardening guides for all devices
Manage data in and out of your network
Minimize administrative accounts
Establish an incident response plan
Enforce similar levels of security across the supply chain.
Ensure suitable security controls in any service agreements (including cloud services)