Docs: Add note about how to use cell tags (#490)

* Update hiding.md

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: kolibril13

docs/render/hiding.md

@@ -8,6 +8,7 @@ kernelspec:
 
 You can use Jupyter Notebook **cell tags** to control some of the behavior of
 the rendered notebook.[^download]
+If you are using cell tags for the first time, you can read more about them in this tutorial https://jupyterbook.org/en/stable/content/metadata.html#add-metadata-to-notebooks
 
 [^download]: This notebook can be downloaded as
             **{nb-download}`hiding.ipynb`** and {download}`hiding.md`