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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.
You're absolutely right. There is a functionality that you might not be familair with. It has to do with how random numbers are generated. Computers can't actually do truly random numbers, so your best bet is to figure out how computers return such a number. You don't need to go as far as look up any specific algorithm or anything, but just be familiar with the concept behind random number generation.