Today Duolingo taught me about affixation in Esperanto, and it is so amazing I cannot but share the whole thing.
AFFIXES
One of the greatest advantages of Esperanto is its flexible system of word particles that can be attached either in front of a word (prefixes) or at the end of a word (suffixes). There are 10 prefixes and 31 suffixes, which can be used to modify any word, as long as the result makes sense. When you finish the Affixes 3 module, you will know all of them! In this lesson, you’ll review one prefix (mal-) and learn many suffixes:
And probably the best part:
(c) Duolingo