Vocabulary is very important in Language Learning. If you don't know the vocabulary of a language, you can neither speak it nor write it. So knowing vocabulary is knowing almost 70 percent of language. But what is the best way to learn and teach vocabulary? The best way to teach vocabulary is to use a theme-based approach. What is a theme-based approach. Theme-based approach deals with vocabulary in themes rather than in isolation. We create vocabulary associations and networks. We develop basic themes and start putting words in them until we get a large bank of vocabulary. The basic example of a theme-based approach is given below. You can use it and make your own dictionary likewise.