How do I implement vulnerability scanning for EC2 instances and containers to improve my cloud security posture?

We ask the same underlying question in different ways.

• How do I implement vulnerability scanning for EC2 instances and containers to improve my cloud security posture?
• We are looking to improve our cloud security posture. Can you recommend solutions that provide vulnerability scanning for EC2 and containers?
• We are looking to improve our security posture by scanning our EC2 instances and containers for vulnerabilities. How do we get started?