Security is one of the first things you should focus on when using AWS. The best starting step is to enable Multi-Factor Authentication (MFA) for your root and IAM users. Always follow the principle of least privilege, giving users only the access they actually need. Rotate your access keys regularly and avoid embedding credentials in code — use IAM roles instead. AWS also provides CloudTrail to log every action in your account, which is super helpful for tracking activity. Don’t forget encryption — use AWS KMS to protect sensitive data. Finally, set up billing alarms in CloudWatch to catch any unusual usage that might signal a breach. Little steps like these go a long way in keeping your AWS account safe.