Ovid's CGI course is definitely a great starting point. Although in the current state, it's really just an introduction. (I believe he's still working on it.)
Obviously, be sure to check out the CGI.pm documentation on the web here, at perldoc, or ideally with "perldoc CGI". Also, check out Lincoln Stein's Official Guide to Programming with CGI.pm. While it's a bit old, it's still a great resource.
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