How international SEO works
Two separate questions sit underneath it. Which language is this page written in, and which country is it meant for? They are not the same. English serves the UK, the USA, Australia and Nepal; Nepal is served in both Nepali and English. Getting the distinction right is most of the discipline.
The answer is expressed in three places. First, URL structure: a country-code domain, a subdomain, or a folder on one domain. A country-code domain sends the strongest country signal and costs the most to run; a folder inherits the authority of the main domain and is usually the pragmatic choice for a smaller organisation. Second, hreflang annotations, which tell search engines that several pages are versions of one another and which audience each is for. Third, the content itself — currency, spelling, contact details, delivery terms — which is what convinces the visitor once they land.
Why international SEO matters
Without it, one version of a page competes with its own siblings. A search engine sees near-identical English pages for four markets, picks whichever it judges strongest, and shows that one everywhere. A visitor in Sydney lands on a page quoting Nepali rupees, or a visitor in Kathmandu reads about delivery to the UK, and both leave.
It also protects the work already done. Sites often expand into new markets by copying an existing section, which dilutes rather than multiplies visibility unless the relationship between versions is declared properly.
Common mistakes with international SEO
The most common is hreflang that does not return: page A points to page B, but page B does not point back, so the whole annotation is ignored. Close behind is hreflang pointing to redirected, blocked or missing URLs.
Another is confusing language with country in the tag itself — using a country code where a language code belongs. A third is automatic redirection by IP address, which traps a Nepali user researching an Australian service on the Nepali page and can stop search engines seeing the other versions at all. Offer a choice; do not force one.
The last is thinking translation alone is enough. Keywords do not translate literally: people in different markets search for the same product with different words, so keyword research has to be done in each language rather than run through a translator.
How to act on it
Decide the URL structure before you build anything, because changing it later means a migration. Map which markets and languages you genuinely serve, and publish a version only where you can support customers there. Add hreflang with self-referencing and return links, and include a default version for visitors who match nothing.
Then check it in Search Console rather than assuming, and research keywords natively in each market. The broader implementation, market by market, is set out on the international SEO service page.