There are books by Andrew Robson including Beginners Guide to Bridge and Improve Your Bridge Game. I find the books by Sarah Landy very helpful. The perfect book doesn't exist so what you need is one that suits you and you enjoy. When specific things come up Googling them brings up several explanations and I select the one that I find easiest to grasp. Bridge has evolved as a game so to make sure you are learning modern Acol use a modern book! Or better still books...