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+The how-to guides provide practical steps for working with ehrQL in your project.
+
+* [Using ehrQL to answer specific questions](examples.md)
+* [How to include and exclude patients from your study population](define-population.md)
+* [Resolving ehrQL errors](errors.md)
+* [How to use dummy data in an ehrQL dataset definition](dummy-data.md)
+* [How to use dummy data in an ehrQL measures definition](dummy-measures-data.md)
+* [How to assign multiple columns to a dataset programmatically](assign-multiple-columns.md)
+* [How to work with codelists](codelists.md)
+* [How to test your dataset definition](test-dataset-definition.md)