Add colab recommendation

units/en/unitbonus1/train.mdx

@@ -9,6 +9,13 @@
           ]}
             askForHelpUrl="http://hf.co/join/discord" />
 
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+We strongly **recommend students use Google Colab for the hands-on exercises** instead of running them on their personal computers. 
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+By using Google Colab, **you can focus on learning and experimenting without worrying about the technical aspects** of setting up your environments.
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 ## Let's train Huggy 🐶
 
 **To start to train Huggy, click on Open In Colab button** 👇 :