While not required, we recommend that you add a helpful title and description to your panel. You can use [variables you have defined]({{< relref "../variables/_index.md" >}}) in either field, but not [global variables]({{< relref "../variables/variable-types/global-variables.md" >}}).
**Description -** Text entered in this field is displayed in a tooltip in the upper left corner of the panel. Write a description of the panel and the data you are displaying. Pretend you are explaining it to a new user six months from now, when it is no longer fresh in your mind. Future editors (possibly yourself) will thank you.
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.
In the Visualization section of the Panel tab, click a visualization type. Grafana displays a preview of your query results with that visualization applied.
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:
