Where does Drupal store the content I create?

Drupal is database driven, it doesn't make files for your content. Your content is in the database.

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My posts & comments are usually dripping with sarcasm.
If you ask nicely I'll give you a towel : )

In the getting started guide, there is a Before you start section
See overview It will save a lot of time.

-Steven Peck
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Test site, always start with a test site.
_{Drupal Best Practices Guide -|- Black Mountain}