As you correctly say, there are lots of AWS Services to choose from.
My role is a Sr AWS Technical Instructor, and I advice customers to start with the "Essentials". One way to do this is register (free) with https://explore.skillbuilder.aws - this is a your learning centre to build your cloud skills. Start off by searching for the "Cloud Practitioner Essentials" online course. This free online course will describe the basic global infrastructure of the AWS Cloud, describe and provide examples of the core AWS services, including compute, network, databases, and storage, help you identify an appropriate solution using AWS Cloud services with various use cases, as well as talking about Security and Cost management.
This will give you the basic skills to (e.g.) spin up a Windows Server and build software on it, or host a web site.
Then you can progress to more advanced topics such as "Serverless" (using AWS Lambda). And if you want to get into AI/ML, you can look into Amazon SageMaker. The "Skillbuilder" portal is a suggested go-to starting point for looking into any of these.
Then, if you want to dive deep into specific AWS products, have a free browse to https://aws.com/products This gives you a breakdown of product by categories, and links to the home page of each product including documentation, and other free resources.
Hope this helps - Enjoy using AWS Services !
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