Background sources like dictionaries and encyclopedias provide introductory information and are a great way to get familiar with new linguistic topics and terminology. Here are some good starting points: starting with freely available sources:
Unlimited users.
A digital archive of recordings and texts in and about the indigenous languages of Latin America. Includes recordings of naturally-occurring discourse in a wide range of genres, including narratives, ceremonies, oratory, conversations, and songs. Many of these recordings are accompanied by transcriptions and translations in either Spanish, English, or Portuguese. Also collects materials about these languages, such as grammars, dictionaries, ethnographies, and research notes.
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