The fastest way to learn English (or any language) is by using pictures. After all, a large part of your brain is devoted to processing visual information. This is also how babies learn their first words. They see hear the word pizza, and learn that they can say the word pizza when they want to talk about.
There are many books that you can use with this picture-learning method. One of the best ones for learning English is DK’s English for Everyone series.
For adults, I recommend the English Vocabulary Builder, which includes 3,000+ words and phrases related to ordinary objects, actions, and situations. There are also special volumes for learning grammar, idioms, and business phrases.
What makes DK’s books different from other picture books is that each section of the book includes listening and review exercises, and you can practice pronunciation on their website or using a free app.