Hi @kestrel17 !
Bitbucket uses 'git' as the mechanism for sharing code. That means you will use git commands to pull the existing repository down to your local machine, and to add or edit additional files before "push"ing back to the shared repository on Bitbucket.
I hope the following intro to git on Bitbucket is useful, that outlines the commands to "pull", "add", "commit" and "push" code changes.
https://www.atlassian.com/git/tutorials/learn-git-with-bitbucket-cloud
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