[Rails] how to use rails debug ?

I wish to  debugging  my app.I install gem and start my console by using --debug option . 

But i don't know how to use it.

 

Give me some helpful starting for core .

I search and get some good pages, but when i fire commands  ,not  working.

How trace methods ?

How to trace variable  ?

Thanks 

Regards

Fahim Babar Patel 

  

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