Security best practices
You can find general AWS security best practices at AWS Security Best Practices.
In addition to following the general AWS guidelines, there are best practices to follow when deploying FortiGate-VM for AWS.
Network Security 
Network Security
NOC & SOC Management
Enterprise Networking
Business Communications
Zero Trust Access 
Cloud Security 
Hybrid Cloud Security
Cloud Native Protection
Web Application / API Protection
SAAS Security
Security Operations 
SOC Platform
Advanced Threat Protection
Endpoint Security