Esperanto today can very easily be learned on the web. Here are a few suggestions to get started:
Lernu!, a free, multilingual online resource to learn the language.
The popular language learning platform Duolingo has Esperanto courses for English, Spanish and Portuguese speakers.
The installable program Kurso de Esperanto offers a quick path to acquiring the basics of the language.
Nothing beats chatting with other Esperanto speakers if you want to improve your skills!
The World Congress itself welcomes speakers of all levels, but do know that your experience will be enriched if you know enough to at least understand the language in most contexts. That’s why it’s also great to meet up with local groups, throughout the year.