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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.
click VIM or EMACS, whichever is highlighted as on
Yes. And yes.
How does one switch it on/off ?
YES! I was on the site for a week before I complained enough to be shown that they could, in fact, both be turned off.
In your settings, you probably have VI(M) or EMACS on. The random key mashing is probably you hitting "i" or "a". Either switch it off, or learn VIM.