@yukinoh1989 looking good!!
It’s pretty common to have noise in spaces with not much light. Adding materials won’t fix that.. Which render engine do you use? Do you make a real render (with F12 and saving the image), or do you make a screenshot? In the last case it’s always noisier because your screen doesn’t use many samples so blender runs smoothly. If it’s a real render, the solutions I can think of are adding light in that area (maybe a porch light?), increase the amount of samples (you can find this in the render tab of the properties panel, more samples gives a cleaner image but watch out it also increases your render time!) and making sure the denoise function is turned on (also in properties panel though I don’t know where in 2.8 I’m not behind my laptop right now).
Try moving the column halfway to the left, so it’s not in the middle and not touching the fence. Maybe that looks better?
