About "Esperanto": the "invented" but ~"complete", easy-to-learn language to travel & meet people today. Best 2nd language for everyone to communicate, etc.

• Today, it is the easiest way to use a rich foreign language that lets you make international friends, travel and possibly even stay for free ("pasporta servo").
• "The language challenge" (interesting short video)
  

  "A former UN and WHO translator, who is also a psychologist -- Claude 
  Piron taught for 20 years at the Psychology Department of the 
  University of Geneva - shares his experience of international 
  communication and discusses the international language Esperanto.
  "

• Esperanto - saves time overall for learning your "real" 2nd language
  

  "why Esperanto really seems to be the best 2nd language
  
  I have started thinking that Esperanto should be everyone's 2nd
  language, simply because it's so easy to learn yet seems ~"complete",
  and more importantly, has been shown to make learning other languages
  easier to the point that overall you learn, say, more French if you
  learn Esperanto first, than if one spent the entire time studying
  French.  So learn whatever you would have learned as a 2nd language,
  for the 3rd, and you saved time and got farther, overall
  (https://en.wikipedia.org/wiki/Esperanto#Third-language_acquisition
  [wikipedia.org]).  And it seems to me the easiest way for someone
  to better understand the grammar of their own native language, by
  seeing a simple & clean example.  (Some in one forum I saw dismissed 
  the studies, but when I read the dismissals it seemed a case of believing 
  what you want, with the studies being more persuasive to me as they 
  put much more work into it; but I would be interested in more info.)
  
  I don't think most users see it as a replacement for a
  first (or native) language, though that has been done intentionally
  by some (per https://en.wikipedia.org/wiki/Native_Esperanto_speakers
  [wikipedia.org], or search https://en.wikipedia.org/wiki/Esperanto
  for "native").
  
  Then there's the side benefit of being by far the cheapest workable
  global route to everyone being able to talk to and understand each
  other, even if haltingly.  For some people, learning English is
  simply too hard.  For the rest, it's still a very big effort, and
  Esperanto is extremely easy by comparison.  In terms of global
  cost/benefit, Esperanto seems like a big win.  (And it's fun.)
  
  (PS: There are other interesting constructed languages each with
  their pros & cons, but none with nearly the same amount of traction
  or interest as Esperanto.  It's interesting to consider, given all
  that has been learned in the field so far, how to "optimize" a
  constructed human language, considering various factors like ease,
  familiarity, beauty, efficiency, computability, or whatever one
  sees as most important.) 
  "

• Resources to learn esperanto (plenty)
• Esperanto resources on archive.org (I found textbooks there, for example, searching archive.org for "american esperanto book"...).
• The Book of Mormon (selections, seems very unofficial) in Esperanto
• I think there is a .pdf of the Book of Mormon in Esperanto around somewhere also, or at least I saw one once, but it might be behind a password now.
• (Suggestions/questions welcome! More information is planned or available on request. Page footer has contact info.)