There is a nice book called "Traveler's Guide to the Firearm Laws of the Fifty States" written by J. Scott Kappas, Esq. This book gives a 1 page summary of the firearm laws for each state. So if you plan on carrying in different states this would be a good book. I purchase a new one every year as the laws are constantly changing.
I see you are in PA. Ohio does not recognize a PA conceal carry permit nor does PA recognize an Ohio conceal carry permit. But, I was able to get a PA permit by sending a copy of my OH CCW permit and of course $25 to a PA sherriff (don't remember which one) and a week later I had a PA conceal carry permit. Doing this gives you a few more states to carry in that your PA permit does not cover. For Example your PA permit does not allow you to carry in Deleware but an Ohio permit does.
Good Luck!