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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.
It happens sometimes, but recently it's not as common as it used to be. When it happens to you, try hitting Ctrl+F5 or Ctrl+R in your browser to perform "hard refresh" of the page - usually helped for me.