Azure DevOps Organisation helps in handling multiple projects efficiently without confusion. Suppose, if you have 10 projects you would create 10 separate Azure DevOps organizations with one project in each organization.
Follow these steps for creating Azure DevOps organization:
Step 1: Create a Microsoft account
Step 2: Open and sign in to Azure DevOps by entering dev.azure.com in google
Step 3: Click on create the organization
Step 4: Enter the project name and location to create an organization
I recommend you enroll in Azure DevOps Training by Intellipaat to learn Azure DevOps.
You can watch this video on Azure DevOps Tutorial to know more about Azure DevOps organization: