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Length, weight, temperature, cooking measures, and data sizes: the exact factors, the metric-imperial gotchas, and quick reference tables.

Timezones, UTC offsets, Unix timestamps, and date math: how computers and calendars count time, and where conversions silently go wrong.

Case styles, slugs, encodings, word counts, and data formats like JSON and CSV: keep text clean, portable, and machine-friendly.

Binary, hex, Roman numerals, number-to-words, and rounding: how the same number is written in different systems and how to move between them.

Hex, RGB, and HSL: what each colour notation means, how to convert between them by hand, and how to pick and check colours with confidence.