What are some essential language agnostic books or tutorials to level-up as a web developer?

I've been a Front-End developer for almost 4 years. I've always worked with Angular framework at work.
I know that there's so much to learn in this field and I want to learn the stuff that every web developer or software engineer should know to be an efficient programmer and builds performant software or web apps.
I like to know about what happens when a web app is running in the browser, what makes it slower/faster, how does bundling work and how to make the bundle smaller, or other concepts that are important to know.
please recommend resources you used that helped you become a better software engineer.