Mine is pretty simple, but I’m not sure it’s that effective.

I collect vegetable scraps, coffee grounds, and eggs shells in a bowl, then empty the bowl into a compost tumbler I keep in my backyard. I don’t put meat, eggs (other than shells, and I rinse those), or dairy out there because those can attract rats. As I said, mine is a tumbler, so I do turn it. But not every day, and it isn’t hard.
The main problem is that a basically have to stop using it for a couple months while everything finishes composting before I use it in my garden. I tried to fix this problem by having TWO tumblers, but picture a typical rowhouse yard with two composters and you’ll see why that was ridiculous!