Learn to internationalize! Connect quickly with learning resources that guide you in applying internationalization to your content development, implementation, etc. Including: Techniques for content developers; a Developer checklist and Language enablement.

If you internationalize, you design or develop your content, application, specification, in a way that ensures it will work well for, or can be easily adapted for, users from any culture, region, or language.
https://www.w3.org/International/i18n-drafts/nav/learn

Accessibility: It’s About People!
Web Accessibility is about ensuring that digital technology is usable by people with disabilities in the real world. Accessibility is an important aspect of diversity, equity, and inclusion (DEI).

Many WAI resources cover the organizational, technical, and standards aspects of accessibility. See these WAI resources help you understand the people aspects:
https://www.w3.org/WAI/people/