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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.
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I think there may be some confusion here, but the task says there is ALWAYS one person lying.
If one of the persons is Mr. Wrong, then by elimination it cannot be Tom (that would entail Bob lying as well), cannot be Bob, nor Gary - by the same logic. Only Fred states something that isn't backed up by the others. So if someone IS lying, it must be Fred; and the tasks says someone IS lying in every example.