Reddit mentions of Linguistics: An Introduction to Language and Communication (The MIT Press)

If you're really interested, I think it's important to have a grasp on what the subfields are and their basic concepts (syntactic trees, phonemes and allophones, morphemes, etc.). In my opinion, an intro textbook is the best way to get this information outside of a classroom. And you can come back to r/linguistics or r/asklinguistics with any and all questions that come up.

Some people will recommend more "novelized" pop linguistics books, like Pinker's The Language Instinct, Words and Rules, various books by David Crystal or John McWhorter, among others. If you want to go any deeper than surface-level, those aren't the way, and honestly might be misleading, confusing, or give you the wrong impression of the current "state of the art" (especially Pinker...). Another option is Linguistics: A very short introduction (Amazon link)

There's no shortage of textbooks out there, and most likely everyone will recommend either what they had in intro themselves, or what they use to teach intro. I personally used an older edition of Akmajian, Farmer, Bickmore, Demers & Harnish.

A recent open-source intro textbook (2018)

See also this reddit thread or the sidebar recommendations.