1. Google Cloud Fundamentals: Core Infrastructure (Coursera)

One such course is provided by Google Cloud which is one of the top cloud services provider. It is familiar as Google Cloud Fundamentals: Core Infrastructure which brings you up to speed in basic concepts and services about Google Cloud Platform (GCP). Coverage of topics, from cloud computing fundamentals to GCP architecture, Compute Engine, Kubernetes Engine, and Cloud Storage Hands-on labs to give you real-life experience. The course is free to audit, you only have to pay if you want to get skilled tested.

2. Introduction to Cloud Computing (edX)

IBM’s Introduction to Cloud Computing, available free on the high-end site edX, is perfect for anyone starting out and looking for an overview of cloud computing. Great for beginners to understand concepts first and then jump into the real content. You will understand important topic of various cloud computing models (IaaS, PaaS, SaaS), different deployment models (public, private, hybrid) advantage of cloud computing etc. This provides insight into a more nascent view of how cloud computing will be integrated into the landscape of the contemporary organization. You can still take the courses without paying for a certificate, which adds an extra level of verification.

3. AWS Cloud Practitioner Essentials (Amazon Web Services)

AWS Cloud Practioneer Essential course in Amazon Web Services (AWS) is the biggest cloud service supplier on the planet. This free intro to AWS covers the key services offered by AWS, security considerations, pricing, architecture principles, and support services — with no assumptions of prior experience. These courses are interactive and self-paced so any learner can dive deep into AWS services. This is perfect if you want AWS certifications like the AWS Certified Cloud Practitioner. And best of all, the course is absolutely free of charge, so you’re getting all that knowledge with only the cost of an internet connection.

4. Microsoft Azure Fundamentals (Microsoft Learn)

Another cloud computing mega-giant is Microsoft Azure, and, as it turns out, their own Microsoft Azure Fundamentals course is also great for beginners as well. This free course on Azure Fundamentals covers Azure's fundamental scope, its primary services, security, and pricing models on Microsoft Learn, aimed to beginners. The course consists of several modules which in turn covers a specialists area on Azure. And they can complete the modules at their own pace, receiving badges as they advance. If you are planning to achieve the Advanced certifications, then this is the best path to build your foundation knowledge first in the Azure.

So, in the case of cloud computing — as with most things — there’s a lot going on, but once you’re aware of your resources, you can figure out the basics. Thereby, these are the best free online courses to learn cloud computing currently available in the market with theory as well as hands-on exercises. If you are reading this now thinking that you might be a first timer or have professional experience, then these courses will enable you to grasp the entire concepts for cloud computing and go far in securing an excellent skill based employment opportunity.