Basically what the title says, when I add an image as a texture, it adds it multiple times. Any way to fix this?
A texture image will necessarily repeat if it’s not large enough to cover the face it is applied to. You either need to make the texture larger or maybe you want to divide the face into sections so you can paint the rest of it with a different material. To do that, divide the face with edges drawn with the Line tool.
If you want to make the texture larger, best thing in SketchUp Free is to draw a rectangle the size you want the texture to be and apply the texture to that face.