in reply to how can I learn well
You are not so clever, so remember to learn from scratch such as 'Learning Perl' book. Follow your learning methodology. Also remember to note down what you have learn that you can refer back. Write down whatever you have figured out how to do certain things in Perl. Ask questions here, when you do not understand something. Slowly but surely you will learn Perl.
--Artist
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Seekers of Perl Wisdom