Hi Rohit,
Here are the steps needed to create and add SSH keys:
https://confluence.atlassian.com/display/BITBUCKET/Add+an+SSH+key+to+an+account
And here is a general introduction on how SSH and Bitbucket work together:https://confluence.atlassian.com/display/BITBUCKET/Use+the+SSH+protocol+with+BitbucketHope that helps.
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