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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.
https://docs.codewars.com/getting-started/finding-kata
Perhaps you also saw that the "focus area" selected was "Rank Up". That means CodeWars will try find things a bit harder than where you currently are, to help you level up faster. If you want to be suggested lower level katas you can switch the focus area to "fundamentals", or alternatively just use the Kata browser to filter to only 8kyus.