Create new repos with git init or clone existing repos with git clone and add remotes.
Creating and Cloning Repositories
# Start a new repo
mkdir myproject && cd myproject
git init
git init --initial-branch=main
# Clone an existing repo
git clone https://github.com/user/repo.git
git clone https://github.com/user/repo.git my-folder
git clone --depth=1 https://github.com/user/repo.git # shallow clone
# Add remote
git remote add origin https://github.com/user/repo.git
git remote -v
git remote set-url origin git@github.com:user/repo.git