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• the basic datatypes, three
• Data Type: Scalar
  • Scalars: How They Work (about numbers, text strings, and binary strings) by pedagogues
• Data Type: Array
  • Arrays: A Tutorial/Reference by jdporter
  • Multidimensional Arrays by CharlesClarkson
• Data Type: Hash
  • Not Exactly a Hash Tutorial by planetscape
  • Hash Keys (strings or numbers?) by robot_tourist
  • The Uniqueness of hashes. by injunjoel
• True and False (aka Booleans)
  • True or False? A Quick Reference Guide by bobf
• References
  • intro to references by busunsl
  • References quick reference by tye
  • Arrays and hashes only with references by grizzley