Such a primer should be helpful for any "newbies" to the subject of Pennsylvania law, whether first-year law students or other students seeking an overview of rules issued by Pennsylvania's three-branch system (legislative, judicial, & executive).
Widener University Law School's library in Harrisburg, PA, is listed among similar facilities at the eight Pennsylvania law schools, as compiled by HG.org, a legal information service. Its law collections can be searched online, just like the online legal collection at the University of Pennsylvania Law School's Law Library, and many others. Some of these resources are restricted to students, but many of the linked resources are usable by anyone.
In Pennsylvania, the most comprehensive online resource of law-related links likely remains Pennsylvania Legal Research Websites, which I reviewed previously. I described it as "the definitive listing of legal links in the Commonwealth." See: PA EE&F Law Blog posting "PA Legal Research Websites" Shines (05/01/08). Younger folks would just say, "Awesome!"
For general questions in Pennsylvania, we could consider another resource: the Ask Here PA service, which is "designed to provide fast answers to your questions, using information found on the Internet and in proprietary databases funded by libraries."
They promise a response to a question sent by email within fifteen minutes or less.
Sounds like an oracle I might use on a tough issue.
-- Socrates (Ancient Greek Philosopher, 470 BC-399 BC)