Also, I sometimes post a short idea as a comment if I think something it will work but I'm not entirely sure how to implement it fully as a practical example.
I can't speak for everyone who comments tips but if I you do want to use what's in the comment I wrote then feel free to do so.
If you are concerned about plagiarism/copy-cat type ideas then simply use foot-notes with credits like we typically see in scientific/engineering documents in cases where the author makes reference to something another has contributed to.