Learning your way around cloud services is a great idea, but I would be hesitant about starting with Lambda and Serverless, or doing only that. It's somewhat of a different paradigm, kind of back-end for front-end developers, or at least people who don't want to deal with infrastructure. While that is a great thing, I think there is value in understanding what a more tradition webserver on AWS looks like with an EC2 instance, EBS volumes, AMIs, security groups, load balancer, SSH access, etc.