1. OS Hardening:
   1. The act of configuring an OS securely, updating it, creating rules and policies to help govern the system in a secure manner, and removing unnecessary applications and services, in order to minimize OS exposure to threats and to mitigate possible risk.
2. Seven steps are involved in keeping a well-maintained computer:
   1. Use a surge protector or (better) uninterruptible power supply (UPS)
   2. Update the BIOS or UEFI
   3. Update the OS
   4. Update anti-virus and anti-malware software
   5. Update the firewall
   6. Maintain the disks
   7. Create an image of the system
3. Summarize the process of hardening an Operating System:
   1. Remove unnecessary applications and services
   2. Whitelist or blacklist applications
   3. Use anti-malware, anti spyware, and anti-spam applications
   4. Configure host-based firewalls
   5. Perform updates and patches
   6. Use group policies, security templates, benchmarks and baselines
   7. Utilize a secure file system
   8. Perform preventive maintenance on hard drives