This book is for people who have had some experience with JavaScript, and want to have a better, deeper understanding of how it works and how to use it well.

Grokking Modern JavaScript, In The Wild

The best way to learn design is to study examples, and some of the best examples of software design come from the tools programmers use in their own work.

This book is required reading for anyone who cares about web performance; it's already established as the go-to reference on the topic

Free Book: In this practical book, Lara Callender Hogan helps you approach projects with page speed in mind, showing you how to test and benchmark which design choices are most critical.