Let’s start with a very simple tutorial that will demonstrate how you can make a simple retro looking circles background in a few easy steps.
1. Create a new file (for this tutorial I used 2000*2000)
2. Hit D to reset the colors palette
3. Go to filter -> Render -> Clouds
4. Go to filter -> Render -> Difference Clouds
You should now have something like this

5. Go to Filter -> Pixelate -> Color halftone (I used a maximum radiance of 100 and for the rest I left the default values)
6. Repeat the last step 2-3 times (hit Ctrl-F) until you get something like this

7. Go to Image-> Adjustments -> Gradient map and choose a gradient that you like
In this case I used this gradient

And here is my final result


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