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To create a repository, I am having an issue with the terminal window entering this command for a Mac
$ git init_my_first_repository
Message: git: 'init_my_first_repository' is not a git command. See 'git --help'.
Assuming "my_first_repository" is your project name what you're actually looking for is:
git init my_first_repository
The "init" is the command you're sending git.