When I was working on something, I wanted one of the objects to be solid and the other to be material. But when I finished making the first thing solid when I tried making the other thing material but it turned the first thing into material too. I searched up and tried some answers, but it didn't work, please help me.
Select the first object, and in the material panel, click on the + button (surrounded by a pink frame in the picture) to create a first material (named Material.001) and change its diffuse color.
Select the second object, and in the material panel, press again the + button to create a second material (named Material.002) and change its diffuse color.
Each object should have a different color.