I successfully completed the LPIC-1 certification exam on Friday. Although I don’t use Linux in a work environment, it certainly doesn’t hurt to have this.
The single biggest resource I used to pass this exam was the Paul Paulito webcast series. The sample exams alone are worth the price—a huge number of my LPI-102 exam questions were very similar to questions I encountered in the Paul Paulito sample exams.
In addition to that, I spent a lot of time reading two books. The first book is entitled A Practical Guide to Linux, by Mark Sobell. It’s nearly eight years old now, but the stuff Sobell covers hasn’t really changed. And it turns out that there’s a third edition which was released last year, with a few great additions (that aren’t really relevant to LPIC-1).
The other book I went through was Linux Fundamentals, an open source book which gets updated regularly. This book has a great deal of overlap with Sobell’s book, but is designed as classroom material, so you have a few pages of text, a number of questions to do, and then answers to those questions. I used it primarily as a way of internalizing the things I learned in other sources.