When you create a new Azure account, you get $200 of free credits to try out various services but these must be spent during the first month.  Sometimes, one month is not enough to test things out that's why Azure now offers a bunch of services that will be free for 12 months when you create a new account.  Here's the list (per month):

• Linux & Windows Virtual Machines: 750 hours of B1S.
• Managed Disks: 64GB x 2 of P6 SSDs.
• Blob Storage: 5GB
• File Storage: 5GB
• SQL Database: 250GB
• Cosmos DB: 5GB
• Bandwidth (outbound): 15GB

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