Julia is high throughput blogger (both, quality and quantity). Usually, I come across a topic and want to understand "just" a bit deeper and there's a post on her site explaining what I'm looking for. Great blog.

Cloudflare's posts cover depth and breadth of the field. They have, obviously, a team of people writing posts in great technical detail. In fact, right before one of the job interviews, I used their posts to understand how packet travels up the linux kernel stack and was surprised to get quizzed on that topic :). Highly recommend it.

Another favorite of mine, Dan Luu: https://danluu.com/