Most SEOs throw around the term
meta tags incorrectly.
meta elements most of the time.
While meta tags belong to the HTML basics, and SEO basics with that, it's important to get your lingo right.
Because when SEOs complain that they're not being understood or respected by developers, it may be because they're (literally) not using the right language to explain what they need.
I know that sometimes was the case with me, in my consulting days. And rightfully so, I was corrected.
I put together an article explaining what meta tags are and aren't, and describe the most important ones from an SEO perspective.
Check it out here: Meta Tags in SEO: the Ultimate Guide