The phrase "main gist" means the most important or essential point or idea of something. It refers to the key message or central meaning that someone is trying to convey.
Sentences with «main gist»
Another big issue with email is that it's often hard to quickly identify the main gist of an email. (inc.com)
You can download the introduction to The Primal Blueprint by signing up for his free newsletter here, or — if you really want to keep things simple — pick up the main gist of his approach in this great blog post, The Primal Blueprint 101. (paleodietnews.com)
There's a little more to it than that, but that's the main gist! (get-laid-more.com)