I started photography about 2 months ago with my Nikon D5300 18-55mm, but I still have issues getting the picture quality I want, especially since I started using my speedlight (yn 560 iv). I see noise in my pictures. Is this normal? I haven't been editing my pictures professionally since my computer is under repairs. I have been using mobile apps. My question is how do I get noiseless pictures with my D5300 camera, and what settings do I need to pay more attention to with my speedlight?