Yes, or you can go to a college or university bookstore and buy their computer books. They have a wide range to choose from including huge thick ones that will teach you everything you need to know to take the MCSE, A+, CCNA/CCNP (Cisco), Network +, etc. I still have muy original book on computer troubleshooting (A+ Certified) and it is a great text.
no, A+ is a certification that you can get for working on computers and such, they have learning books that teach you everything you need to know about the A+ cert and what will be on the test....etc.
what kind of things are you looking at learning? the dummies books are good for beginners in my opinion, I have a couple and I find them easy to understand and easy to learn from.