It is good to hear that you are looking forward to switch your career from Business analyst to Azure Architect. Right now the demand for cloud computing is huge. Pursuing career in cloud computing is very beneficial according to current situations.
Here are the few topics one must to know to become a Azure Architect:
Deploying and configuring infrastructure
Implementing workloads and security
Creating and deploying apps
Implementing authentication and securing data
Developing for the cloud and for Azure storage
If you are interested in learning more about this technology it is better to go for instructor-led training. For that I would suggest you to take up this Microsoft Azure Certification Master Training by Intellipaat. This training provides you with all required skills to become an Azure Architect.
Before that do check out this video on how Intellipaat helped Kshitij to switch his career from Business Analyst to Azure Architect -
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