Here is a quick start
All of these are free to audit and are official courses that are designed by AWS.
First the AWS basics
https://www.coursera.org/learn/aws-cloud-practitioner-essentials
Then choose either Node or Python.
https://www.coursera.org/learn/building-modern-node-applications-on-aws
https://www.coursera.org/learn/building-modern-python-applications-on-aws
Then learn SAM
https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/what-is-sam.html
Dive deeper when you get a chance