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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.
I wouldn't do it. If the kata's author would wanted to give a hint, it would be written in the kata's description. Even new learners should learn to search for some method by themselves or use some other things to solve the kata by themselves. And if they can't, and only then, they can ask for a hint.
Especially a hint with poor performance characteristics :)
There is no need to leave a hint in every kata.