I myself am planning on taking Linguistics once I make my way to college. On my own time I spend it learning from the Germanic and Nordic language families. Those being Swedish and Norwegian mainly, though with also a good amount of German, and small portions learned from the Romantic languages.
I'm starting with working within language families as I often find it difficult when trying to learn languages that, for the majority, have no common roots with each other.
What I would recommend for world languages is learn some basic conversational pieces in the language and get the grammar down(most important), then possibly try taking a trip to a country that speaks the language, if you can, to get a better understanding of the way it works. If you're that dedicated with learning the language, that is.
A good website for learning world languages is
Duolingo(although it's currently in the process of adding Klingon). It's free to sign up and, from experience I can say that, they've done a bang up job with the site and the way it works. Most notably is the fact that with each language they give each audio recordings for the words and sentences for them. It helps with pronunciation and proper usage of tone, seeing as that can be a big factor in some languages. If you're gonna learn another language, best to start sooner than later. It's proven that children and teens are much better at learning other languages than most adults.
At one point I became interested in the linguistic qualities present in
My Little Pony: Friendship is Magic and I started doing some observative research of my own. It's still on-going, and my primary focus is on the text written in the book depicting Nightmare Moon's return in episode 1 of season 1, that being the ten pictographs on the page which tells the tale. Although, most of this work was also done with someone who had spent a good amount of time on it before I had. He was a lot of the reason I started it in the first place.
Along with that, in my studies of Linguistics, I use what I learn to further develop a series of constructed languages that I've been working on for a book that's still in the making. I discovered a few years ago that this was my passion and my talent, and I'm looking forward to seeing where this kind of profession will take me in the world.
It's always so refreshing to see so many people everyday with such an interest in other languages and the study of them. It's not a greatly demanded profession, so I always enjoy finding people with similar interests and passions as my own in this area.
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I apologize for the length of this message, but I hold so much passion for this kind of work. Any form of linguistics or language study is something I can definitely get into.)