Ten simple lessons convey the basic grammar and systems of esperanto, dictionaries and useage can build on that base.

The official membership worldwide is currently about .........................

Its activities include an annual congress in a different country each year. Several thousand people commonly attend.

The UEA also supports ...........................................................
 

It is completely phonetic. 

There are no exceptions to the 16 rules of grammar.

Inanimate things do not have gender.

Prefixes and suffixes are correct wherever they are logical.

Many of the Latin roots are familiar to English-speakers.