Here are some additional readings to help you understand terms such as ethnicity, race, privilege, etc.
What is race? Is race for real? (From “Race the Power of an Illusion”, PBS)
What is the difference between race & ethnicity? (From “Race the Power of an Illusion”, PBS)
The origins of the term “privilege”, New Yorker interview of Dr. Peggy Mcintosh
White privilege: unpacking the invisible knapsack, by Dr. Peggy Mcintosh
This article “Why You Should Avoid These Racial Terms” is not exhaustive by any means, but it is a good place to start in terms of figuring out what previously accepted words are no longer acceptable in conversations about race.