This document discusses different types of dictionaries and how they can be used by language learners. It describes bilingual dictionaries, monolingual dictionaries for learners, and thesauruses. Learners' dictionaries provide headwords, pronunciation, definitions in simple language, examples, collocations, synonyms/antonyms. The document recommends training students to understand dictionaries and look up new words from texts in short lessons. Teachers can have students find words before lessons and test each other with definitions.