I just took a little bit of my time to do one of the latest Azure exams. The Azure exam AZ-900 Microsoft Azure Fundamentals is, as the name suggests, a basic fundamental exam covering some general knowledge about Microsoft Azure. The exam covers a basic understanding of cloud concepts, core Azure services, security, privacy, compliance and trust, as well as Azure Pricing and support.
AZ-900 is a good exam if you are just starting with Azure and the cloud. It is not just a marketing and sales exam, even do it is a very light exam. you will need to have some technical know-how. If you are planning to take this exam I have some recommendations for you. Understand the benefits of cloud computing and the different cloud models. Go trough the list of Azure services, make sure you know what services are available and for what you would use them. Also make sure that you understand the concepts of Azure in general and in Azure governance, like Subscriptions, Management Groups, Azure Policies, Azure Resource Groups, Role-Based Access Control and many more.
You can find more detailed information on the Microsoft exam website. There you will find all the skills measured in this exam.
I also highly recommend that you make an Azure free (or paid) account and try out different Azure services. But if you really wanna get ready for the cloud and especially for Microsoft Azure, and exam AZ-900, check out Microsoft Learn. Microsoft Learn is a great free learning platform, where you have free guides, walkthroughs and a hands-on experience. Microsoft Learn also provides you some more advanced trainings and guides, to get some deeper understandings of Microsoft services.
With that I wish you happy learning and good luck with the AZ-900 Microsoft Azure Fundamentals exam!