AWS Security Fundamentals

To start learning AWS Security, start with free digital fundamental training.AWS Security Fundamentals (2nd Edition):

https://www.aws.training/Details/eLearning?id=34259

Later to go more deep dive you can go for 3 days training on Security Engineering on AWS.

https://www.koenig-solutions.com/security-engineering-on-aws-training-certification-course#:~:text=The%20Security%20Engineering%20on%20AWS,%2C%20networking%2C%20and%20database%20services.