If you want to learn to speak and understand Portuguese, the best solution is to start with the dictionary. But you need more than just the dictionary: You need a way to learn the language, and that is exactly where the word trainer comes in. 

The word trainer is designed to help you to improve all aspects of your language: your pronunciation, your reading, and your writing. It also includes various exercises, which makes the app useful for any level. 

Portuguese is a very rich language with many words, which makes it a perfect language for learning. If you want to practice it, the best solution is to start with the dictionary.