You want to keep good books? Then read a good book.
There are good training resources available for beginning and advanced users of QuickBooks. Here are some of the highest rated ones on Amazon:
QuickBooks 2011, the Missing Manual, by Bonnie Biafore. 720 pages. Pogue Press. 4.7/5 Stars on Amazon. Great balance between instructions on specific features and basic accounting advice.
Running QuickBooks 2011 Premier Editions: The Only Definitive Guide to the Premier Editions, by Kathy Ivens. 608 pages. CPA911 Publishing. 5/5 Stars on Amazon. Tips, tricks, shortcuts, and workarounds to unleash the full power of the Premier editions.
QuickBooks 2010 Solutions Guide for Business Owners and Accountants, Laura Madeira. 528 pages. Que Publishing. 4.5/5 Stars on Amazon. For intermediate to advanced users, this guide helps you use QuickBooks to understand where your business is currently, and where it’s going.
This last one is not a book, but it is a great do-it-yourself training resource: QuickBooks Essentials LiveLessons (Video Training): For All QuickBooks Users [DVD-ROM], by Laura Madeira. 1 DVD. Published by Que Publishing. 4.4/5 Stars on Amazon. This training DVD has 18 lessons to help walk you through every essential QuickBooks skill.
These resources cost under $30, but can fill in some of the gaps in your QuickBooks knowledge.