AWS is a dominant cloud provider with 40.8% market share, but common misconfigurations can lead to security breaches or gaps in infrastructure. Using the root user as the main AWS account user is a major no-no, as it leaves all AWS resources and services vulnerable if the credentials become compromised. Instead, use Federation or AWS IAM Users for human users, and create an IAM user for yourself with administrative permissions. Long-living secrets should not be stored in application codebases; instead, rotate access keys every 90 days and delete unused ones. Using * permissions in IAM policies can grant too much access to resources, so assign policies to IAM Users, Roles, Groups, and workload profiles. UnAuthorized AWS services should not be used in accounts, as compliance requirements vary by industry and region. Data stored in AWS storage services should be encrypted with organization-managed encryption keys. Monitoring tools like CloudTrail, CloudWatch, VPC Flow logs, and S3 Access Log should be enabled to detect security breaches. Security groups can control traffic from the internet, but having all services in one account is a recipe for disaster. AWS RDS instances should be configured securely, with limited access to Security Groups and default credentials changed. Finally, prevent dangling DNS entries by regularly auditing processes and monitoring for unknown or expired DNS records.