Cloudflare Blog
The most consistently readable engineering blog in the industry. Deep posts on networking, DNS, TLS, caching and database scaling, plus unusually candid incident reports. If you only follow one engineering blog, this is a strong pick.
Guide
System Design
Cloudflare
Advanced
Free
Why this one is unusual
Cloudflare publishes proper post incident write ups, including the ones that make them look bad. Reading a few of those teaches you more about operating systems under load than most architecture material does.
For the underlying concepts these posts assume, Design Gurus covers the fundamentals in a structured order.
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