This is from the first grow I did, PF tek style but with a few updates. I did a couple monotub grows a year later that went great but I can't for the life of me find any pics.
The white pebbles are perlite and the cake is mostly rice bran meal and fine vermiculite, with a little coffee and gypsum.
How did you learn to do this?
Believe it or not there are a lot of youtube tutorials last time I checked
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in addition to everything else, unclebens on reddit has a lot of beginner resources; using bags of precooked rice is easier in principle than sterilizing your own mushroom food
I watched Let's Grow Mushrooms and read a bunch of posts on shroomery.org