Hello Rashid,
Thank you for your comment. The reason I don't simply pip install toolbox is that this command searches pypi; the public repository for python packages.
I have not yet uploaded Toolbox to this repository so it won't find it. Therefore we have to specify where pip can find this package, which is the Github repo.
The reason I choose not to upload it to PyPi was to demonstrate you can pip install from your git repo. This way you can use, share and manage non-public packages.