Read up on the camel book, the perl cookbook, and to some degree "Learning Perl Objects, References & Modules".
Memorize all the special variables like $!.
Know what all the built-in functions do like map, grep, sort, and format.
Learn regular expressions and their modifiers like i and x.
Passing variables to functions (i.e. shift and @_).
difference between a literal and a reference.
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