Here is good read
https://ioflood.com/blog/git-switch-vs-checkout-pros-and-cons/

Git Switch and Git Checkout are both used for switching between different branches in a repository. However, Git Checkout is a versatile command also capable of discarding changes and creating new branches, while Git Switch is a newer, more specialized command focused solely on switching and creating branches.

It sound like using old git version < 2.27.0.

Check git version
git --version

Here is good read https://ioflood.com/blog/git-switch-vs-checkout-pros-and-cons/

Git Switch and Git Checkout are both used for switching between different branches in a repository. However, Git Checkout is a versatile command also capable of discarding changes and creating new branches, while Git Switch is a newer, more specialized command focused solely on switching and creating branches.

It sound like using old git version < 2.27.0.

Check git version git --version

Thanks, very helpful materials. That being said, I submitted a PR with some added information about git checkout, but the repo owner does not seem to be active in reviewing the PRs, so I am still waiting for his review.

Here is good read https://ioflood.com/blog/git-switch-vs-checkout-pros-and-cons/

Git Switch and Git Checkout are both used for switching between different branches in a repository. However, Git Checkout is a versatile command also capable of discarding changes and creating new branches, while Git Switch is a newer, more specialized command focused solely on switching and creating branches.

It sound like using old git version < 2.27.0.
Check git version git --version

Thanks, very helpful materials. That being said, I submitted a PR with some added information about git checkout, but the repo owner does not seem to be active in reviewing the PRs, so I am still waiting for his review.

There is only one maintainer so it may take while to be merged. Mine also pending there.

check out your github version