I understand your confusion and I am here to help :)
When you sign up for an Azure Free Account, you receive a certain amount of free services and credits that you can use within a first 30 days. Beyond that, there are a select set of services that remain free for the next 12 months, and other services that are always free (with some limitations).
It seems that you are entitled to "SQL Server: 250 GB S0 instance with 10 database transaction units (12 months)". This means for 12 months you shouldn't be charged for an S0 instance up to 250 GB.
Sometimes, the Azure Portal will show an estimated service cost even if they're covered under a free tier or a credit. This estimate is a general informational point to show you the cost outside of the free subscription or once you've exceeded the free tier limitations.
If you have strictly adhered to the free tier offerings (like using an S0 instance and not going beyond 250 GB), you should not be charged. However, any usage beyond the stated free limits would result in charges.
What I recommend :
- Periodically check your Azure cost and usage in the portal to ensure you're not incurring unexpected charges.
- Set up budget alerts so you're notified if and when you approach a certain cost threshold.
- If you're unsure or want clarification about a certain service and its associated costs, reach out to Azure support or consult the Azure pricing page for details.