Tutorials

Understand once and for all the difference between ARG and ENV, ENTRYPOINT and CMD, and what HEALTHCHECK, VOLUME and EXPOSE actually do in your Dockerfiles.

A Pull Request is not just the mechanism to merge code — it's a conversation. Learn to write PRs that people actually want to review and give feedback that builds instead of blocks.

GitHub Flow strips branching down to the essentials: one stable branch, short-lived feature branches, Pull Requests for review, and deploy after every merge.

Same model, same day, thirty seconds apart — two completely different answers depending on how you frame the question. Here's the RCTF framework and why it changes everything.

A list you can't modify is just a tuple with extra steps. Learn to add, remove, and transform elements with the most important list methods — and write your first list comprehensions.

Learn to use multi-stage builds in Docker to separate the build environment from the runtime environment, with real Go and Node.js examples that shrink images from hundreds of megabytes down to a handful.

Build secure Docker images: avoid running as root, scan for vulnerabilities with Trivy, pin versions the right way, and manage secrets without baking them into your image.

Git Flow formalizes the branch prefixes you already know into a structured process: permanent main and develop branches, plus temporary branches for features, releases, and hotfixes.

How to name branches so your team understands at a glance what they contain, which ticket they map to, and when it's safe to delete them.

Visual mode isn't 'using the keyboard like a mouse'. It's a three-variant tool with direct operations and a block mode that simulates multiple cursors with zero plugins.

A single variable can only hold one value. Lists hold as many as you need — and let you access, slice, and iterate over them with almost no ceremony.

Learn how Docker's layer caching system works, how to order Dockerfile instructions for fast builds, and which base image to choose for lean, efficient images.