Renaming a file also doesn't give you any context as to what changes were made or who they were made by. When multiple team members edit the same file, overwriting may occur and it becomes difficult to keep up with the latest file version.
With Git, you can easily follow your source code's revision history and track changes. You can also go back in time to learn about how the version has changed and who has made the changes. When the latest version of a file is on a shared repository, Git will prevent unintentional overwrites by anyone on your team who has an older version of the file.
A version control system like Git makes it easy to:
Keep track of code history
Collaborate on code as a team
See who made which changes
Deploy to staging or production