It depends. I think it covers almost everything about C++ but the exercises are not easy. In places it goes too fast and I cant follow it. I'm thinking of getting another book to be honest. I have looked at "Jumping into C++" by Alex Allain which moves at a slow pace. But if you are a fast learner the primer might be ok for you
Along with this website, I also use usenet. There are some really good newsgroups for C++. Have a look at comp.lang.C++ or comp.lang.c++.moderated - you need a newsreader like thunderbird or pan and you need to set it up with your isp's newserver though.
On the newsgroups there are lots of c++ experts that will help you out.