I'm learning some tutorials that is industrial background. I know this tutorial is focused on Eevee system. but I want to get a better quality of scene. that's why I want to use Cycles, but there are some problems such as lights, fogs those pictures are including lights,fogs that I learned from the tutorials. yes it's very worked in Eevee, the lights has blur, the fog is staying at the background obviously, but the Cycles version doesn't work, How can I solve this problems? I want to have blur lights, fogs in my scene
In eevee, there is a feature called bloom you are using. But unfortunatley cycles doesn't have such an option , unless you use compositing. I recommend you watch some compositing tutorials on making lights glow in cycles. Here is the short summary of the process: select the objects you are using as a light, and then go to object properties: pass index to 2 on all of them (Remeber to set it to two on all the objects that have emmision shaders or are covering a lamp underneathe.). Then in the render layers tab enable object index (Make sure you are in cycles to find this option.). Then render your image, switch to the compositing tab, and follow the compositing setup in the image below.