Expertise-The skill of an expert/ Expert opinion or commentary

https://www.merriam-webster.com/dictionary/expertise

I first came across this word while we were going over ENG 1101 English Comp 1, City Tech Library paper in class today. I have heard this word a couple times before, I kind of knew what it mean’t but couldn’t really give myself a perfect definition. The first half of the word is expert and that is basically someone who is an extraordinaire at doing certain things. After that i looked up the words and i saw these two definitions. I felt like both definitions weren’t complete so i put both. Both of these definitions give the perfect meaning.