FreeRice is an amazing learning app of many subjects and languages that you can learn. The more correct answers you get, you can feed children in need faster, and make groups with your friends to get high scores. The English vocabulary sections have so many levels of difficulty that you can challenge. 

The categories I recommend for English language learning are: 

English Vocabulary

English Grammar

The Global Goals

Healthy Eating for Goals 2 & 3

The Nobel Peace Prize

Hunger Heros

Climate Action

Geography

Humanities

Math

Science

Thank you, United Nations and the World Food Programme! Image by lesserland from Pixabay