If you are looking for free, high-quality resources to supplement your learning, consider these popular options: System Design Primer (GitHub)
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Written by a Google engineer with over 15 years of experience, this book is designed as a "tactical playbook" for acing FAANG-level interviews. Systematic Problem Solving If you are looking for free
: In-depth look at load balancers, API gateways, CDNs, and distributed caches.