Deductions & credits

Ran out of space, I asked this question after another user asked about reporting their Mortage Interest and property taxes, and somebody answered: "If you are not itemizing you don't need to report that stuff". Then it left me wondering what else am I not suppose to report. I assumed when you receive any tax form from anybody, by law you must report it. I am not trying to omit or hide anything, but don't want to be typing in info that is not supposed to be entered in my case either.  My husband has W2, I sell a couple paintings a year so we need to use self employed version as I have a business with inventory and I need to fill out schedule C. Other than that the stuff I listed above is really all that pertains to our situation.