martinfowler.com
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MartinFowler.com is a long-running software design and architecture resource offering in-depth articles, essays, and tutorials on patterns, refactoring, architecture styles, and practical system-design guidance.
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ByteByteGo
Free newsletters and visuals for system design
SystemDesign.one
Interactive system design resource, practitioner favorite
System Design Primer
Master system design! Learn the principles & practical considerations for building scalable systems with this comprehensive course by donnemartin.
Grokking the System Design Interview
Ace your system design interview! Learn scalable system architectures with DesignGuru's "Grokking the System Design Interview" course.
highscalability.com
High Scalability is a blog-style archive of real-world architecture case studies and in-depth articles on building scalable web systems. It covers databases, caching, messaging, microservices, and cloud infrastructure with practical patterns and lessons from large-scale sites.
educative.io/system-design
Educative's System Design course on educative.io offers structured lessons and interactive content covering system design fundamentals, scalable architectures, and common design patterns. It includes real-world case studies, practical design approaches, and practice problems to help learners prepare for system design interviews.