Update preparation.md

benna100 · web-flow · commit 2962e5218f03 · 2020-11-25T14:41:15.000+01:00
diff --git a/javascript2/week3/preparation.md b/javascript2/week3/preparation.md
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 - Callback functions: https://www.youtube.com/watch?v=pTbSfCT42_M (15 min)
 - Read about Asynchronous vs. Synchronous programming: http://www.hongkiat.com/blog/synchronous-asynchronous-javascript/ (10 min)
 _Please go through the material and come to class prepared!_
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+## Flipped classroom videos
+- [Javascript callbacks](https://youtu.be/hjgunSqSPaA)
+- [Working with asynchronous code in Javascript](https://youtu.be/RTrua6CRNEM)
