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The first thing you should do after installing Git is to set the user name and email address. This is important because every Git commit will use this information, and it will be written into every commit.
Configure username
Use git config --global user.name "<username>" to add your username to the git configuration. E.g:
git config --global user.name "TCatTime"
Configure mailbox
Use git config --global user.email "<email>" to add your own mailbox to the git configuration.
E.g:
git config --global user.email [email protected]
Precautions
If the --global option is used, the command only needs to be run once, and Git will permanently record this information.