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If you've ever managed a web server that serves images to thousands of users, you've probably run into the problem of serving the right image size to the right context. A 1200x800 hero image looks great on a desktop, but it's pure waste on a mobile screen or a thumbnail grid. The traditional answer to this has been generating multiple image variants at upload time, but that approach gets messy fast. A cleaner and more flexible solution is to resize images directly at the server level, on demand, using nothing more than nginx and its built-in image filter module. This guide walks you through setting that up from scratch, including caching so your server isn't processing the same image twice.

Docker is an open platform that allows developers to build, ship, and run applications inside containers. A container packages an application together with its runtime, libraries, and configuration so it behaves consistently across environments. The same container image can run on a local Linux machine, a staging server, or a production cluster with predictable results. This approach reduces environment related issues and makes deployments more structured and reproducible.

Claude Code is already capable of doing a lot. But out of the box, it has no idea how you work. It doesn't know your stack, your standards, or what a good output looks like for your specific project. Skills are what bridge that gap. They let you define exactly how Claude should behave for any recurring task, and once that's in place, the quality and consistency of what you get back changes completely.