What is the Learn Top 300 Spanish Words application, how does it work?

According to the introduction of Aliaksandr Uvarau, Learn Top 300 Spanish Words is a Education app on the Android platform. There is currently a 1.1 version released on Apr 15, 2017, you can see the details below.

In order to communicate fluently in any language, no need to memorize thousands of words. There are statistics, under which 90% of our speech, no matter our age, educational level and the language in which we speak is made up of 300-350 words. In this application, we have compiled the most frequently used 300 Spanish words.

Sounds were added.