If your ever wanted to show a list of categories (taxonomy in Drupal speak) in a Drupal’s Block, here’s what you should do:

• Download Sitemenu module from here and upload it to your Drupal server.
• Activate it in Drupal Admin-Modules dashboard.
• Complete the setup in “Admin-Sitemenu”.
• Position the display in “Admin-Blocks”.

This is an example with the categories displayed on the left sidebar of a Drupal webpage.