Meaning of breaking and working in assignment 1

Guys, i just want to understand what the comments of “working” and “breaking” in the examples in assignment 1 mean?
The second question is that should i commit to the data given in the cells of the examples? I mean can I change them?

working -> the code doesn’t throw an error
breaking -> the code does throw an error

Can’t understand the second question. By committing you send a whole notebook in it’s current state to, which you can view by going to your profile.

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