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Hectal
Phase 0Beginner1 of 11 in Docker

The Docker Mindset

Why containers exist, and the vocabulary everything else in this course builds on.

Before running a single command, understand the PROBLEM Docker solves. Every feature in Docker — images, layers, volumes, networks — exists to answer one question: 'how do I make my app run the exact same way everywhere?'

The core loop for every topic in this course, same as the System Design syllabus: Learn → Close the tutorial → Explain without notes → Try it in a real terminal → Break it → Fix it → Explain the trade-off.

0/4 · 0%
4 topics ~54 min 4 code blocks & diagrams
Start with the first topic
1
0.1

Why Docker Exists

"It works on my machine" is a packaging problem, not a coding problem. Docker packages an app with everything it needs to run, so the same package behaves identically on a laptop, a test server, and production.

13 min practice

2
0.2

Virtual Machines vs Containers

Both give you isolation, but at completely different layers of the stack — understanding exactly WHERE each one draws its line is the single most-asked Docker fundamentals question.

13 min 1 diagram practice

3
0.3

The Docker Architecture

Client, Daemon, Registry — the three pieces that work together every time you type a docker command, and the client-server model that explains a surprising amount of 'weird' Docker behavior.

13 min 1 diagram practice

4
0.4

Installing Docker & Your First Command

Get Docker running on your machine and prove it works with the smallest possible container — this is the 'Hello World' every Docker journey starts with, and it's worth understanding every word of the output.

15 min 2 code practice