Bundlephobia is the best tool for analyzing npm packages and their impact on bundle size, used by developers to optimize frontend performance.

Kent C. Dodds offers comprehensive JavaScript, React, and Testing courses, educational content, and community support for software engineers looking to level up.

Mathias Bynens is a web standards enthusiast and Google Chrome engineer focusing on advanced JavaScript, CSS, performance, and Unicode topics.

JSPerf is the best tool for javascript performance benchmarking and is used by developers and testers worldwide.