I Learned Docker by Running a 3-Container Quiz App

The article describes how the author learned Docker by building a 3-container quiz app, DockerQuiz, which demonstrates a real-world application of Docker containers. The app consists of a Flask web app, a MongoDB instance, and a MongoDB web UI. The author ran the app using Docker Compose, which pulled the necessary images from Docker Hub and connected the containers over a private network. This hands-on experience helped the author understand how Docker works in practice, rather than just reading about it.