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How the series work
A series is a set of articles on one topic, called parts. Each part is numbered, and each one assumes you read the parts before it.
Part 0 is the introduction to a series. When a series has a part 0 published, read it first.
You do not need to read every series. Pick the topic you want to understand and stay with it.
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Java Collections & Data Structures: From Scratch
Build the data structures behind Java's collections, from arrays and ArrayList toward B+ trees and lock-free queues, and see how the JVM memory model shapes them.
Start here Part 1: How the JVM Actually Lays Out Arrays in Memory -
How Docker Works: Container Internals Under the Hood
How containers work under the hood: namespaces, cgroups v2, overlay2 storage and the runc runtime.
Start here Part 1: What Docker Actually Adds to Linux Isolation Primitives
If you already know the basics
You can skip the introductions and go straight to the part you need. Find it on the engineering page.