Development Collaboration with Pull Request

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Say your partner is Tom.

1. Fork Tom's repository;

2. Clone your forked repository to your laptop;

3. Commit modificatioins to your laptop repository;

4. Push modifications to your forked repository;

5. Send a pull request in your forked repository on github website;

6. Tom accept your request and merges into his repository;

7. In your laptop repository, add upstream repository as a remote source;

8. Sync with the upstream repository with git fetch and git merge;

This is a whole cycle. Repeat above steps to collaborate with Tom.

Ref:

How to update GitHub forked repository?

Pushing to a remote

Syncing a fork

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