Robin's Laws of Good Game Mastering

I have read many GM guides in my time. Many DM Guidebooks, articles, etc. because what GM is not chasing that elusive star to improve and be better? This book manages to provide more basic assistance and advice than a 250 page DMG book on a mere 32 pages.

The basic premise is that in order to have more fun at the table, you need to identify the player type and offer the kind of game that appeals to all your different player types. The Pathfinder GM guide built upon that, but Robin Law elaborates on it, with some advice how this would e.g. affect creating adventures and campaigns.

Was a fantastic read.