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While the basics of this page are still correct, there are newer resources/tips available on GitHub.  Here's the simplest path:

• DSpace follows GitHub's "Fork and Pull model" of collaborative development. 
• This means you should fork our DSpace GitHub repository, adding your changes to a branch in your forked repository, and then create a pull request from your fork. 
• In your Pull request, link back to your created issue by saying that the PR "Fixes #issue-id" (e.g. "Fixes #12345") as this will link your PR with the issue ticket.

GitHub also has a ton of great guides on working with Pull Requests. They are very useful in understanding the general concept of creating/managing your Pull Requests (PRs).

• About Pull Requests
• Create a Pull Request
• Addressing Merge Conflicts (in PRs or on branches)
• Reviewing Pull Requests

As noted below, we also recommend forking the main DSpace GitHub repository (https://github.com/DSpace/DSpace). Again, GitHub has excellent guides on managing forks:

• Working with Forks
• Creating a Pull Request from a Fork

Another (third party) tutorial on the entire PR process (including "squashing" your commits into a single commit): https://yangsu.github.io/pull-request-tutorial/