I think everyone should know at least two languages.
Looking back, I wish I would have been forced to learn a second language while I was learning English. Regardless, I'm enjoying the process of learning Spanish in my adulthood. It exposes you to an entire new world and culture--especially when you travel.
The most difficult thing about learning a new language is not having anyone to practice with. Also, not living in an environment that forces me to speak Spanish is what works against me.
If anyone else is learning Spanish (or fluid), feel free to reach out to me if you want someone to practice with (or to help, if fluid). Hell, if enough people are interested maybe I'll start a new thread dedicated to sharing Spanish learning resources.
What language are you learning and what methods have helped you most in your journey to learning a 2nd language?