* No Universal Agreement: There's no single, universally accepted definition of what constitutes a "language" versus a "dialect." This leads to different classifications.
* Continuously Evolving: Languages change over time, new dialects emerge, and sometimes languages merge or split. The landscape is constantly shifting.
* Undocumented Languages: Many languages, especially those spoken in small, remote communities, remain undocumented or poorly documented.
However, here are some resources to get you started:
* Ethnologue: This is a comprehensive catalog of languages worldwide, considered a reliable source. [https://www.ethnologue.com/](https://www.ethnologue.com/)
* UNESCO Atlas of the World's Languages in Danger: This atlas focuses on languages that are endangered or critically endangered. [https://www.unesco.org/en/articles/unesco-atlas-worlds-languages-danger](https://www.unesco.org/en/articles/unesco-atlas-worlds-languages-danger)
Keep in mind: These resources provide a snapshot in time. The linguistic landscape is always in flux.