Area 01 · 6 topics

Developer Foundations

Git, the shell, debugging, regular expressions, text encodings and how computers store numbers — the skills you use every day, explained from the inside so they stop being magic.

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Git, From the Inside

Commits as snapshots, branches as pointers, merge vs rebase, reflog and recovering lost work.

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The Command Line

Pipes, redirection, exit codes, environment variables and basic scripting.

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Debugging

Form and test hypotheses, use debuggers, read stack traces, and bisect with git.

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Regular Expressions

How matching works, groups, backtracking and catastrophic patterns (ReDoS).

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Text & Encodings

ASCII, Unicode, UTF-8, Base64, and JSON vs binary formats.

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Numbers in Computers

Integers, overflow, floating point, why 0.1 + 0.2 fails, and why money isn’t a float.

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