Each panel needs at least one query to display a visualization. You write queries in the Query tab of the panel editor. For more information about the Query tab, refer to [Queries]({{< relref "queries.md" >}}).
1. Choose a data source. In the first line of the Query tab, click the drop-down list to see all available data sources. This list includes all data sources you added. Refer to [Add a data source]({{< relref "../datasources/add-a-data-source.md" >}}) if you need instructions.
1. Write or construct a query in the query language of your data source. Options will vary. Refer to your specific [data source documentation]({{< relref "../datasources/_index.md" >}}) for specific guidelines.
While not required, most visualizations need some adjustment before they properly display the information that you need. Options are defined in the linked topics below.
Save the dashboard. Either press Ctrl/Cmd+S or click **Save** in the upper right corner of the screen.
Your options vary depending on the changes you made and whether or not it is a new dashboard. We recommend you add a note to describe your changes before you click **Save**. Notes are very helpful if you need to revert the dashboard to a previous version.
## What next?
Our Grafana Fundamentals tutorial is a great place to start, or you can learn more about Grafana by reading one of the documentation topics linked below:
