Esperanto is the most popular constructed language in the world and was the creation of a 19th century Polish doctor named L.L. Zamenhof.
In his 1887 book Unua Libro he laid out his ideas for an international language which was designed to facilitate international
communication and to help overcome the differences which existed between humanity. The name Esperanto, which means 'one who hopes', is a
direct representation of this peaceful ideology. Esperanto is not an official language in any country so determining the number of speakers
is not easy, but estimates count at least a few million people. Without a doubt though, since Esperanto was conceived the interest in the language and the number of people learning it has continuously increased and Esperanto resources have also grown substantially. Whats more, it has been determined in a number of studies that learning Esperanto before other languages helps improve the acquisition of the students 3rd language.
Lernu is a treasure trove for learners of Esperanto. Includes over 25 units for learning and also has a separate section dedicated to grammar, media materials, and forum.
Duolingo is a popular language learning platform and they offer Esperanto. Check out the review here.
Ba Ba Dum is a cool game website to expand your vocabulary in Esperanto.
Unua Libro is the original book published by Zamenhof laying out the Esperanto language. Due to copyright law the book is now available for free online. Click the link to read the whole book.
Tuja Vortaro is an easy to use online dictionary for Esperanto. Can be used in multiple languages.
Reddit - Esperanto can be used to tap into the existing Esperanto community and discuss the language with enthusiastic learners. Like most of the Reddit threads for langauges they also have good links to resources.
Esperanto Reddit Blog provides PDF lists of various vocabulary and also has links to external resources. Easy to use and navigate as well.
La Sankta Biblio is entire Holy Bible in Esperanto. Even if you are not the religious type this can provide you with both reading practice and vocabulary acquisition.
Esperantujo maps out Esperanto speakers around the world and gives some information about them. This is a fantastic project because one of the core ideas of Esperanto was to bring people together.
International Esperanto Association has a website which allows one to search for Esperanto associations in your country and other links to all things Esperanto.
Esperanto - Learning and Using the International Language This is a text meant for the absolute beginner. It starts off by covering the history of Esperanto and the idea of an international language. The main text includes lessons, exercises, a graded reader, and a one way dictionary.
100 Most Frequently Used Esperanto Words + 1000 Example Sentences This book is currently only available on Kindle
Concise Esperanto and English Dictionary This dictionary by the Teach Yourself group is a popular choice despite it being published in the early 1990s.
A Complete Grammar of Esperanto This book was printed over one hundred years ago but is still a primary resource for learning Esperanto grammar.
Where Can I Study It?
Stanford University offers free basic Esperanto classes to students and the general public.
Ludwik Lejzer Zamenhof Mr. Zamenhof created Esperanto.
Bridge of Words: Esperanto and the Dream of a Universal Language This book is a biography of the Esperanto language from its humble beginnings in the mind of LL Zamenhof to its role in unifying people under a common dream of peace.