How to Create an Azure Event Hub in the Azure Portal

1. Sign in to the Azure portal.
2. Create a resource group by selecting Resource groups from the left navigation pane, then selecting Create.
3. Enter a unique name for the resource group and select a region for it.
4. Create an Event Hubs namespace by selecting All services from the left navigation pane, then typing "Event Hubs" in the search bar and selecting Event Hubs from the results.
5. Select Create on the toolbar, then enter a name for the namespace and select a region for it.
6. Choose the pricing tier (Basic or Standard) and leave the throughput units settings as they are.
7. Create an event hub within the namespace by selecting + Event hub on the command bar of the Overview page for your namespace.
8. Enter a name for your event hub and select Review + create.

That's it! You have successfully created an Azure Event Hub in the Azure portal. If you need more information about Event Hubs, you can check out Microsoft's documentation.