How to clone already created repository in bitbucket?
Are you using Bitbucket cloud or server version? Use one of these, depending on the version.
Cloud: https://confluence.atlassian.com/bitbucket/clone-a-repository-223217891.html
Server: https://confluence.atlassian.com/bitbucketserver/clone-your-repository-and-manage-files-locally-776798211.html