Hey Sky!
Build it! Use something like Azure Storage to host video objects and build a site to stream that video from Storage to a front end. I always learn best by building dumb, pointless websites to learn cool new tech.
I see the future of the cloud in containers and serverless. I love containers because I build multiple services, have something like Kubernetes glue it all together and ship it off to the cloud without me having to understand too much what's going on at a lower level. Particularly tools like Helm and Draft are helping container n00bs be productive quickly.
I think serverless is going to continue to grow because it allows full stack devs to be able to be truly full stack and ship powerful features without the full support of an ops team. It allows devs to focus on what makes their business unique and less on administrating app servers. I expect that serverless is going to wending its way into every company's stack.
- Similar to answer one, I build a lot of pointless stuff to learn new tech. I recently built an inventory tracking system to get a better grasp on Azure Event Grid and Azure Logic Apps. For cloud stuff, Microsoft Learn is great for Azure stuff and I've heard good things about acloud.guru for general cloud stuff. For front end, I love frontendmasters.com because they have a mantra of having one high quality course for each subject which is why I continue to teach my material there. For back end material, the limited amount I've taught myself has been either docs or some courses from Pluralsight.