ISO codes, carrier codes and industry standards, in copy-ready tables with sources.
Merchants search for a single hard cap on variants and staff accounts when the real limits sit inside plan pricing and theme section code, and this reference lines up what is actually documented against what the market's theme code shows.
The usual advice to just upload a big photo and let Shopify handle it misreads what the Theme Store actually requires and what theme code actually does with an image once it lands in a section.
Merchants search for country-by-country gateway lists but the actual limits sit inside theme code and Shopify's plan tiers, which is where this piece looks instead of inventing regional rules that were never measured.
Standard UTC offsets from UTC-12 to UTC+14 with example cities, plus which markets move their clocks for daylight saving and which stay fixed.
All 183 two-letter ISO 639-1 language codes in one table, for hreflang tags, store translations, product feeds and Accept-Language headers.
What GTIN, UPC and EAN actually mean, how many digits each has, which barcode carries them, and where retail POS ends and case logistics begins.
Every active ISO 4217 currency in one table: alphabetic code, numeric code and currency name, for checkout settings, product feeds and payment APIs.