This image shows the arm before rotation.
Here its after rotation. How to correct it and is there any tutorial series for weight painting?
My .blend file can be found here: 
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$\begingroup$ Could you provide your .blend file to be able to help you? $\endgroup$ – Tak Apr 2 '17 at 7:20
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$\begingroup$ OK, But how to attach it here? $\endgroup$ – Prasoon Apr 2 '17 at 10:34
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$\begingroup$ using this link blend-exchange.giantcowfilms.com $\endgroup$ – Tak Apr 2 '17 at 12:41
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$\begingroup$ <img src="https://blend-exchange.giantcowfilms.com/embedImage.png?bid=3069" /> $\endgroup$ – Prasoon Apr 2 '17 at 13:19
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$\begingroup$ no difference in what u shared and what I gave $\endgroup$ – Prasoon Apr 4 '17 at 15:55
