Well, first u should choose a cloud platform like Amazon Web Services (AWS), Microsoft Azure, or Google Cloud Platform (GCP) to focus your learning efforts. Each platform offers a wide range of services and tools for building and deploying distributed applications. Then, find appropriate courses or books about it. Talking about books, I can strongly recommend "Cloud Native Patterns: Designing Change-tolerant Software", "Architecting for the Cloud: Best Practices", "Cloud Computing: Concepts, Technology & Architecture", and "Azure for Architects: Implementing Cloud Design, DevOps, IoT, and Serverless Solutions on your Public Cloud".
While Java EE can certainly be used for web development and has its strengths in certain enterprise contexts, Python with Django offers a more streamlined and accessible approach for integrating AI into web applications, thanks to Python's rich AI ecosystem and Django's ease of use and flexibility. So I'd vote for Python Django.