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Properly classifying new content according to the topical areas provided is one of the more daunting challenges. The topical classification system is known in the Drupal system as "taxonomy" which is a term you'll recall from your biology course.
If you add content you'll need to supply a title and then choose from one or more taxonomies, or lists of topics. Some pointers:
Make it something meaningful.
Most of the taxonomies allow selecting multiple terms. Use the usual web method of holding down the control key while clicking on each desired term.
Some content types have more than one taxonomy. It's usually optional as to whether you have to select any terms but it is helpful to the overall topical organization to select appropriate terms. For example, a blog has a "main topical area" taxonomy plus a "main blog topic" taxonomy. A Forum entry has only a "forum" taxonomy.