Vocabulary is important when learning a language. Any language, including, of course, English, and thousands and thousands of words. In many cases, even those speaking a language does not know all the words of that language. There is too much to learn. In fact, according to several sources, I came across, there are only 800 words you should know to speak English. The list is too long to display here, but a good start to read through this list and see how many words you know.