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Containers have revolutionized the IT world and it can be hard to know where to start. In this course, Docker Captain Nigel Poulton guides you through the basics all the way to proficiency.

You'll learn why we have containers and how they work. You’ll run through the basics like images, the Docker engine, and containers. With the basics out of the way, you'll then containerize an application and learn how to run it. Throughout the course, Nigel will demystify all the jargon and buzzwords. When you're done, you'll be ready to use Docker in the real world.

The Beginners Guide to Docker

## Sharing layers to improve performance
Multiple images can and do share layers. This leads to efficiencies in space and performance.

Let's take an another look at the `docker image pull` command with the `-a` flag that we ran previously to pull all tagged images in the `nigelpoulton/tu-demo` repository.

# Sharing layers to improve performance
Multiple images can and do share layers. This leads to efficiencies in space and performance.

Let's take an another look at the `docker image pull` command with the `-a` flag that we ran previously to pull all tagged images in the `nigelpoulton/tu-demo` repository.

See how sharing layers can optimize the image build process. 

About the Course

Containers From 30,000 Feet

Docker

The Big Picture

The Docker Engine

Images

Containers

Containerizing an Application

Conclusion

Installing Docker

Sharing Image Layers

Sharing layers to improve performance