Nothing can be more intimidating than trying to figure out what all the hieroglyphics are on the various parts of a pattern. Don't have a pattern panic attack! Take a look at each of the standard pattern parts one at a time, and you'll be shopping for patterns like a pro in no time.
A virtual environment is a Python tool for dependency management and project isolation. They allow Python site packages (third party libraries) to be installed locally in an isolated directory for a particular project.