How do I avoid plagiarism by a source I didn't know existed?

asked 2018-04-30 11:39:56 -0500

This post is a wiki. Anyone with karma >75 is welcome to improve it.

I had an edit removed on Project 562's page due to a concern of plagiarism by near exact verbage found on a webiste I had never vsiited nor knew existed. I am trying to avoid this mishap for the future.