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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.
Understanding some of the tricks used in regular code golf kata without the alpha-numeric restriction will definitely be a good place to start. It'll help you understand a little bit about how JavaScript can be abused and misused to make code shorter. My first Code Golf kata I did was the twelve days of christmas and it took me a lot more time and googling than I'd like to admit to figure it out.
Honestly? Get to be less new. Program in JS for a while, read up on it ( you would have encountered
_as a valid name at some point ), learn - and come back later.