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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Yes, see it for yourself:
https://docs.python.org/2.7/library/functions.html#round
https://docs.python.org/3.5/library/functions.html#round
No need to apologize, you're correct.
If there are are more than 10 projects but fewer than 3 unpopular projects the result will be too short.
Therefore this solution is not correct.
As for that second point: Yes, that's on purpose. If there are 10 or fewer projects the result must contain all of them.
I just got "lucky" that this covers the test case without unpopular projects.
Your question is too vague, rephrase it. One possible answer is write it in the trainer.