But jQuery selectors are not exactly like CSS selectors, despite the healthy amount of overlap. While I knew the parts that were like CSS this book helped me grasp better the parts that are different, such as all the filter methods that are available and traversing DOM subtrees. It also helps to find out the things related to selectors that have been updated and changed as jQuery improves itself. And I found out some of the ways I’ve been writing selectors aren’t exactly bad but could be improved to enhance performance. So this was definitely worthwhile. Now I have to make sure I utilize these principles in my next web project.