One simple exercise to learn German is the "Flashcard Method", which can be done using physical flashcards or a digital app. This method helps you build your vocabulary and improve your memorization skills. Here's how you can do it:

1. Choose your method: Decide whether you prefer using physical index cards or a digital flashcard app. There are several free and paid flashcard apps available, such as Anki, Quizlet, or Memrise.

2. Create flashcards: If using physical cards, write a German word or phrase on one side of the card and its English translation on the other side. If using an app, create a new deck and add digital cards with the German word or phrase on one side and the English translation on the other. Start with basic and common words or phrases such as greetings, numbers, colors, and everyday items.

3. Organize your flashcards: Group the cards into categories (e.g., nouns, verbs, adjectives, or by theme) to help you better structure your learning.

4. Study the flashcards: Go through the cards one by one, reading the German word or phrase aloud and trying to recall its English translation. Once you have the correct answer, put the card aside (or mark it as correct in the app) and move on to the next one. If you struggle to remember the translation, place the card back in the pile (or mark it as incorrect in the app) to review again later.

5. Review regularly: Spend at least 15-20 minutes per day reviewing your flashcards. Consistency is key to retaining the information.

6. Expand your collection: As you progress in your German learning, continue to add new words and phrases to your flashcard collection, whether physical or digital. Regularly revisit and update your cards to ensure you're constantly building your vocabulary.

Remember that learning a language takes time and practice. Combine this exercise with other learning methods, such as language apps, textbooks, and conversation practice with native speakers, for the best results.
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