I use a worm factory 360. It has trays with mesh in the bottom so the worms can move up to the next level when the tray has been consumed of food leaving behind just the finished castings. To harvest I open the top and pull off the stack of trays along with the bottom most tray and clean the base underneath it. There's usually a few lost worms, castings and liquid worm leacheate in there so it all gets scraped into a bin. Then I take the bottom most tray and put it on the top and nest the whole stack into the base. I have a HO fluorescent shop light that I turn on which they hate & the worms burrow deep to escape it. They leave behind the fresh EWC that I scrape up along with a few stubborn worms into the same collection bin. I add most of it to my recycling soil and save a bit for making teas.
Each time I start a new tray I add some spent recycled soil with a little extra perlite for aeration and some oyster flour for grit. I feed them mostly all kitchen scraps like banana peels, rotten apples, strawberry tops, carrot shavings, lettuce, and tomato tops/bottoms, etc.. I get a lot of worm food when I make salads; they love any fruit and/or veggie scraps. I also give them lots of cannabis leaves & small stems from harvesting plants & any dead leaves or fans I remove. They don't eat stickers so I gotta remove them or I'll find them later in the bin lol. I have a bag in the freezer I put all the worm food in which helps break it down fast once thawed. I add coffee grounds and eggshells too but I cook the eggshells in the microwave for 2 mins to sterilize them which makes them brittle and ez to shred to bits with a squeeze. When I feed I have a small container that I put the frozen worm scraps in and I sometimes add corn meal to it just because i have some on hand to get rid of and they also seem to like alfalfa meal if I add it to their food. I let it thaw overnight and feed in the morning when by that time most of the shit has turned mushy; perfect for them.