AWS has numerous Cloud services. If one is learning AWS, it is not feasible to learn each and every one of them initially. Which are some of the AWS Services which one can start with and the rest can be learnt afterwards?
A good starting point would be understanding what are regions, availability zones and security groups.
After that, understanding IAM and roles.
Then go for EC2.
With that, you will be able to start to see lots of possibilities.
In most cases, I'd recommend learning how to create, modify, and control server instances. That tends to lead you into security and AWS DNS services. You might also want to learn how to work with S3 store.
As an alternative, you could look at the Elastic Beanstalk/EC2 services. Instead of having to deal with an entire VM, you work with services containers such as Tomcat.
It's worth looking at how elastic scaling works, as well, if you plan to provide large-scale services.
After that, there are so many options that I generally look at what I'm trying to do - such as use one of the AWS database servers - and read up as needed.
Some people, when well-known sources tell them that fire will burn them, don't put their hands in the fire.
Some people, being skeptical, will put their hands in the fire, get burned, and learn not to put their hands in the fire.
And some people, believing that they know better than well-known sources, will claim it's a lie, put their hands in the fire, and continue to scream it's a lie even as their hands burn down to charred stumps.