I'm an amateur Excel user with a simple question on Excel 2013-

This is a new computer with Excel & prior computer was from 2003 ! Yet I never knew how to do this even on the old computer, though. When I'm doing a multi-page spreadsheet, I'd like to have different column widths on page two than what page one has, & different widths on three than page two, etc etc. When I change widths on page two it always changes page one widths also. I thought I was inserting a page break between page one & two (something I'm not sure how to do anyway) but it always adjusts page one (and ruins it!) before I get done. I'm hoping it is simple to learn this & I'd bet it is a basic you all know- THANKS Gary from Ohio