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Update 3. Get Only What You Need, and Fast.md
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`projection` reducing data to fewer dimentions. data to **speak up**
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### 📚 project in MongoDB
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![image](https://user-images.githubusercontent.com/51888893/204366718-ef8d4286-c012-4e38-a3d5-333b909cf9e0.png)
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### 📚 missing fields
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![image](https://user-images.githubusercontent.com/51888893/204366992-86256645-a32c-426b-ada0-8d04b32c4922.png)
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### 📚 simple aggregation
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![image](https://user-images.githubusercontent.com/51888893/204367355-6e6b185f-635c-4eee-839a-a8affb1d7759.png)
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