It's basically saying; in order to make Python PIP work like it used to, add this argument to the end of the pip install:
--break-system-packages
Or put the following information inside the ~/.config/pip/pip.conf file so that you don't have to keep adding the switch at the end of each pip install command every time:
[global]
break-system-packages = true
Since you are not a programmer working with Python packages (I think?), you don't have to worry about using venv.