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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.
I'm starting to learn to program. I made a code similar to this but it didn't work for me, and when I modified it according to this (Basically copied it), but I don't understand what the dots in "[...columns]" actually do? Why does it have to be there?