IAM Security Tools, shared Resonsibillity, IAM Summary
IAM Credential Report (account - level) : report that lists the account's users and the status of their various credentials.
IAM Access Advisor (user-level) : Access advisor shows the service permissions granted to a user and when thoese services were last accessed.
you can download it from credintial report

Shared Responsibility Model for IAM
AWS Responsibility:
Infra : globla network security
Config and vulunerability analysis
conpliance validation
User:
Users,Groups, Roles, Policies management and monitoring
Enable MFA on all accounts
Rotate all of the keys often
Use IAM tools to apply appropriate permissions.
IAM Summary
Users : maspped to a physical user, has a password for AWS Console
Groups : contains users only
Policies : Json document that outlines permissions for users or groups.
Roles : for EC2 or AWS services
Security : MFA + Password Policy
AWS CLI : manage the AWS services using conmand-line
AWS SDK : manage the AWS services using a programming language
Access Kets : access AWS services user CLI or SDK
Audit : IAM Credentail Reports & IAM Access Advisor