AWS has lots of training available.

https://d1.awsstatic.com/training-and-certification/ramp-up_guides/Ramp-Up_Guide_Security.pdf

https://explore.skillbuilder.aws/learn

Guide to AWS security credential formats

https://summitroute.com/blog/2018/06/20/aws_security_credential_formats/

The honest AWS health status dashboard

https://stop.lying.cloud/

Which services are available in which region. Surprisingly patchy

https://awsservices.info/

Diagrams of AWS services

https://www.awsgeek.com/