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Docker in Practice: Images, Containers, and Orchestration Docker helps you package an application and its dependencies as an image. An image is a portable blueprint that can be shared. A container is a running instance of that image, with its own writable layer, network, and process space. This makes applications more predictable across different machines. Images are built in layers. Each command in a Dockerfile adds a layer. Layers help with caching: if you change one part, Docker rebuilds only what is needed. This keeps builds fast and repeatable. Small, focused images also start quicker and use less disk space. ...

Version Control Essentials: Git Basics for Every Engineer Version control helps you track changes, compare ideas, and share code with teammates. Git is the most popular tool for this purpose. It works on your computer and on servers, so everyone can stay in sync without losing work. Getting started with Git To begin, install Git and set your identity: git config user.name ‘Your Name’ and git config user.email ‘you@example.com’. Then create a folder, initialize a repository with git init, and start tracking files. Add files to the staging area with git add, then commit with git commit -m “Initial commit”. Git stores history in a hidden .git folder. It helps to create a .gitignore file to skip build artifacts, logs, and secret files. ...