I seem to have two versions of python 3.7.9 installed

[snippsat]

I apologize, but I do not understand. I installed requests but have no idea what to use it for. Looking at the documentation is says that it is "HTTP for humans".

It was just demo to see it works,Requests is used instead of urllib.
Can also uninstall with pip.

python -m pip uninstall requests
# Or just pip as it point to 3.7 for you
pip uninstall requests

To do the same as Gribouillis from command line.

python -c "import sys; print(sys.executable)"

I still do not know the difference between what typing "python" and typing "python3" is. Or, to where does each one point?

In older distors did python(point to Python 2) and python3(to Python 3).
With new distros is like Ubuntu/Mint 20 then Python 2 removed,and python always point to Python 3.
As python point to 3.7 for you then it's okay.

To use Anaconda activate (base),then python and pip will point to Anaconda.

conda activate base