Ruby Guides 
Ruby Guides
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What is the ‘rescue’ clause in Ruby?
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How to handle exceptions in Ruby?
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What is the purpose of the ‘include’ keyword in Ruby modules?
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How to use modules in Ruby?
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What is inheritance in Ruby?
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How do I access instance variables in Ruby?
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What are instance variables in Ruby?
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How do I create an object from a Ruby class?
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