There are many resources to learn languages, so I won't be sharing those. However, there are some resources which explore the world of endangered languages. First, reading K. David Harrison's book "When Languages Die" is an absolute must. To get a taste of the book, watch the interview video where Harrison talks about the book and gives beautiful insights. Another great resource to learn about endangered languages and efforts to conserve them is the Endangered Languages Archive! Finally, all of the data is from Ethnologue: Languages of the World (Eberhard, David M., Gary F. Simons, and Charles D. Fennig [eds.]. 2024.Twenty-seventh edition. Dallas, Texas: SIL International. Online version).. There are many other resources to gain insights on these beautiful languages, but this can at least give you a small taste.