The landing page, perhaps a dimension you take for granted. That you look at, but don’t actually look at. Just like looking at what time it is without actually knowing or understanding what time it is. In my opinion, the landing page is a powerful dimension in Google Analytics. Let me explain why I think that.
What is a landing page ?
A landing page is the first page of a session. Let’s say Sarah is visiting your site. She starts her session on your site on blog post X and then reads blog post Y. In this case, blog post X is the landing page. You can translate that to the first page people land on when visiting your site. Google Analytics offers you a landing page report. You can find it in the Behavior section, Site Content, Landing Pages:
Source : Yoast