I used to have a compost pile of all the typical things like food scraps, lawn clippings, fish guts and carcasses, Pest moss, rich dark loam, raw green wet cow manure, coffee grounds, lime and every month or so I would uncover it and roto till it.
After 2 years I took a sample to the nursery to have it tested...........they told me, whatever you are doing, keep doing it, you have very rich well balanced soil...........it was by accident, not by skill