Is it bad to learn two foreign languages at the same time? 
Is it a good idea to learn two languages simultaneously?
Is there any possibility to learn three different languages well? What should I learn as a second language? Can polygots share their wisdom on how to learn multiple languages? What is the way to learn another language? Is Duolingo the best and quickest way to learn a new language or is something better available? What is the best way to learn another language? Should I learn the languages on Duolingo in order? What are your thoughts on this? What is the best/fastest way to learn to speak a second language? How should one learn languages? How effective is Duolingo in learning a language? What is a good order to learn these languages? What's the best way to learning more languages? What makes it easy for polyglots to learn multiple languages? What is the best way to learn a different language? Should I learn Spanish, French, or Russian as a second language and why? How did you learn another language? What is the best order to learn languages? How hard is to learn new languages? Are the benefits of learning a third language enough to compensate the time and effort I'll spend doing it? What is it like to speak multiple languages fluently? How do I learn another spoken language? Why shouldn't you learn another language? What is it like learning Spanish and German at the same time? Why do some people choose to learn a third language? How did you learn to speak several languages? What is the best ways to learn new languages? Can I learn Portuguese, Spanish and French at the same time? Can you learn Japanese language in 2 weeks by yourself? What are the most efficient ways to learn a new language? Can I learn a language using apps such as Babbel or Duolingo?