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Each commit object contains the author and the committer.This makes it possible to identify who did the change.
A remote-tracking branch proxies the state of a branch in another remote repository. If you are working in a certain branch, the creation of a new commit advances this pointer to the newly created commit. Successors are retrieved by traversing the commit graph starting from branches or other refs, symbolic references (for example: HEAD) or explicit commit objects.One of the branches is the default (typically named _master uniquely identifies a new revision of the content of the repository.This revision can be retrieved later, for example, if you want to see the source code of an older version.This way a branch defines its own line of descendants in the overall version graph formed by all commits in the repository.You can create a new branch from an existing one and change the code independently from other branches.
Bare repositories are only changed by transporting changes from other repositories.