Clarification on pipenv and virtualenv

In the Virtual Environments document (dev/virtualenvs/) we start off by learning about pipenv but then move on to the lower level virtualenv. It is a little unclear under what circumstances we would be using virtualenv? I mean, I know it can practically be used, but for folks approaching Python for the first time it can be confusing.

I'm not suggesting the virtualenv section should go away, but maybe some additional clarification would be helpful. Something along the lines of:

"pipenv wraps a lower-level virtual environment utility - virtualenv. If you want to learn about using virtualenv, read on. Otherwise you can skip to the next chapter."

Where I personally really started getting confused is under Other Notes. Without scrolling back up the page it is not clear if this section is a part of the virtualenv discussion or if it is meant to be top-level and thus applicable to both pipenv and virtualenv.

Things become murkier when we start throwing additional utilities into the mix - as someone without experience with these utilities it seems to me that together they run somewhat parallel to pipenv.

Thanks for your hard work on this guide!

Beginne mit dem Dokument zu Virtual Environments in dev/virtualenvs/ und lies die Abschnitte pipenv, virtualenv und Other Notes gemeinsam. Stelle klar, wie pipenv mit virtualenv zusammenhängt, gib an, wann Leser die Informationen zu virtualenv überspringen können, und mache deutlich, welche Hinweise für welches Dienstprogramm gelten; abgeschlossen ist die Aufgabe, wenn ein Python-Leser ohne Vorkenntnisse dem Abschnitt ohne Verwirrung folgen kann.