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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.
What the description means, is that you need to find the number of 1's in a given integer's binary representation (Binary representation being what the given integer is in 1's and 0's). In the case of 1234, it has a binary representation of '10011010010'. There are exactly 5 1's to be found in the integer 1234's binary representation: 1 00 11 0 1 00 1 0, so it returns 5.