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git pull is the command that brings your current local branch up-to-date with the state of the remote branch on github. Use this command when you want to make sure your local branch is all caught up with changes push'ed to the remote branch. The pull command executes git fetch, which retrieves the actual changes followed by git merge, putting the changes in your codebase.

Some useful Git terms

master: this is the main code branch, equivalent to trunk in Subversion. Branches are generally created off of master. However, it is usually recommended that you not do your work directly in the master branch. Instead, you should look to create new branches frequently (e.g. a new branch for each feature/ticket you are working on), and once that work is completed, merge it back into the master branch. Both branching and merging are much easier in Git, and should become a part of your daily development practices. For more information, see Pro-Git's chapter on "Basic Branching & Merging"

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