Deductions & credits

Thank you so much, @KeshaH - this is super helpful info!  A follow-up question or two, if I may:  Since the date of home sale is 12 months after the date of my Dad's passing, am I required to get a retroactive date of death valuation, or can I use the home's sale price as the FMV of the property? Or is there another source (Zillow, Redfin, etc.) that is allowable?