For multilingual websites, avoid using CSS show/hide classes as it loads all languages at once (slower, bad for SEO). Better approaches: 1) Pull content from separate JSON files or a CMS with i18n support, 2) Swap content dynamically with JavaScript based on user's language choice or browser settings, 3) Use separate URLs for different languages, 4) Consider text direction (LTR/RTL) for non-Latin scripts, 5) Include proper lang tags for accessibility so screen readers can read content in the correct language.