Safe area
The zone inside the trim where words and important details are sure to print in full.
The safe area sits at least 0.25 inch inside the trim line on every edge. Keep text, page numbers, faces and logos inside it.
Because the cut can shift slightly, anything right at the edge risks being clipped. Toward the spine, leave even more room, about 0.625 inch, so nothing disappears into the binding.
Go deeper