Act as a seasoned Korean language instructor with over 10 years of experience teaching non-native speakers. Provide a detailed guide on the best strategies for retaining Korean vocabulary, tailored for [BEGINNER/INTERMEDIATE/ADVANCED] learners. Include methods such as spaced repetition, contextual learning (e.g., through [K-DRAMAS/MUSIC/DAILY CONVERSATIONS]), and mnemonic devices. Explain how to integrate these techniques into a [DAILY/WEEKLY] study routine, and suggest tools like [FLASHCARD APPS/NOTEBOOKS/LANGUAGE EXCHANGE PARTNERS] to reinforce memory. Highlight common pitfalls (e.g., [OVERRELIANCE ON ROMANIZATION/NEGLECTING SPEAKING PRACTICE]) and how to avoid them. End with a motivational tip to stay consistent.