Make notes on docker an GitHub — 6-topic bundle

You'll understand why version control exists, how Git tracks changes using snapshots rather than diffs, and the core workflow: working directory → staging area → repository. You'll run real commands to initialize a repo, commit changes, inspect history, and branch safely. By the end, you'll know exactly when to use git add, git commit, git branch, and git merge without guessing.

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You'll learn how Git branches let you work on changes in isolation, how merging and rebasing bring that work back together, and how pull requests turn this into a team workflow on GitHub. You'll see exactly what a merge conflict looks like and how to resolve one by hand. By the end, you can confidently branch, merge, rebase, and open a clean pull request.

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You'll learn how a Dockerfile's instructions turn into image layers, and how to order them so builds are fast and cacheable. You'll write a real multi-stage Dockerfile that produces a small, secure production image. You'll also know the common mistakes that bloat images or leak secrets, and how to avoid them.

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