Web fonts are critical infrastructure that most developers handle poorly, causing performance issues and accessibility problems. The article covers font loading strategies, modern CSS techniques like font-display and metrics override descriptors, the benefits of WOFF2 format, proper subsetting techniques, and why system font stacks should be the foundation. It explains how to eliminate layout shift, optimize for global scripts, and avoid common mistakes like icon fonts and third-party CDNs. The guide emphasizes treating fonts as performance-critical assets rather than decorative elements.