Summary
You have learned quite a bit in this hour and are continuing down the road to UNIX expertise. You learned about file redirection. You can't go wrong by spending time studying this information closely. The concept of using filters and building complex commands by combining simple commands with pipes has been more fully demonstrated here, too. This higher level of UNIX command language is what makes UNIX so powerful and easy to mold.
This hour hasn't skimped on commands, either. It introduced wc for counting lines, words, and characters in a file (or more than one file; try wc * in your home directory). You also learned to use the uniq and sort commands.
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