That depends on your skill set. There are several Azure certification 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 also gives you hands on experience.
For Azure you can either take this end-to-end certification 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: