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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.
Yeah, even with explanations I'm not quite grasping what I'm supposed to get.
It's a JavaScript quirk, not necessarily something someone solving 8kyu katas (or those unfamiliar with JavaScript in general) would know about.
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Look at what you can do, not at how much time passed ;)
Consider it depends much on many factor, but being a beginner I think you could assess yourself among 30 to 60 mins for this one.