There's so much going on within AWS I'd suggest approaching it the other way and identifying a few examples of things you'd need, and then researching how AWS implements those things - if you need a mainstream relational database, AWS has RDS or Aurora, etc. Need to make sure your RDS database is only accessible from your private backend app? Thats a Security Group. Need somewhere to run that app as a Docker image? ECS or EKS... which may require learning a bit about IAM so you can make sure your own user / deployment user has the right permissions to manage all these resources. Its pretty straightforward to pull a thread - but there are lots of threads you could pull.

But this has been shared here before and is still pretty good: https://adayinthelifeof.nl/2020/05/20/aws.html