I had downloaded a Word template for my textbook and pasted my contents in that template and reformatted. I may have deleted a couple of section breaks, but now I just realized that my margins are off. For a 8.5x11 portrait document, in "Page Setup -> Margins", its showing that top and bottom margins are 1" each, and the inside and outside margins are 1.25". Importantly, the Gutter is set to zero. Header and footer are each 0.5" from edge.
I saw a video saying that the gutter should be 0.3". In that example, the margins were 0.5". I am unsure whether I should change margins, gutter, etc. in my document. I am especially confused since I thought I was working off a template where these would be preset. Any thoughts?