The camera sees everything, and it makes clutter look worse than it does in person. A bench with six things on it reads as messy in a photo. With one or two, it looks styled.
Today is about removing things, not adding them. Grab three boxes and label them Keep, Store and Donate. Work room by room, starting with whichever room will be the hero shot: usually the living area or kitchen.
Kitchen
Living & dining
Bedrooms & bathrooms
Tonight's homework: Take a quick phone photo of each main room tonight. You will compare them on Day 3.