The Migrate module itself contains some excellent examples of data migrations implementing the various APIs provided by the module and serves as the canonical documentation for how to write a migration. In this lesson we'll take a look at the beer and wine import examples provided with the migrate module as a way to familiarize ourselves with the concepts discussed earlier and to be able to see the code that makes up a basic migration before attempting to write our own. In practice these examples serve as a great starting point and can often times be copy/pasted and adjusted for your own needs.
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This video covers a topic in Drupal 7 which may or may not be the version you're using. We're keeping this tutorial online as a courtesy to users of Drupal 7, but we consider it archived.