"Basic Scripting for Builders" is the little brother of "Speaking LSL". Oriented to builders, it works at a very slow pace all the required concepts to understand scripts and know how to modify them.
First book covers the basic structure of a script, and answers to questions that even some scripters don't know.
Basic Scripting for Builders 1, available in Marketplace.
Then, the second book covers how to create scripts that react to touches, how to put two actions on touch, and how to put together several scripts on touch, so you have the same actions in just one. Enjoy!
Basic Scripting for Builders 2, available in Marketplace.