That depends on your skill set. There are several Azure certifications available that tackle different topics and skill set ranging from general basics to very specific topics. If you are a beginner and know nothing about. Some of these certifications are specifically for a particular role, for instance, if you wish to be a Microsoft Azure DevOps engineer then you need to have AZ-400 Microsoft Azure DevOps Solutions Certification and so on.
If you are planning on learning Azure, as a beginner it would be better to start with an online course that teaches you the basics and gives you hands-on experience.
You can either take this Azure Online Course which will teach you the basics of Azure or if you are just a beginner and wish to get your feet wet you can watch this end-to-end azure tutorial:
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