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Fellow #DDD folks out there, Can someone explain to me what is a _practical_ difference between a vertical slice and a bounded context?

Vertical Slice is a single feature, bounded context is a whole module (so can be a group of vertical slices).

How granular a feature is?

Add item to basket is a single feature

question here: - if "add item to basket" is a vertical slice - then is "change item quantity in basket", "remove item from basket" etc etc - are these all separate vertical slices? You end up having hundreds of them?

I’d group them in modules/submodules/features. You don't need to have a slice as a module and a flat structure. That wouldn't be maintainable.

See also an example of nesting vertical slices into (sub) modules. It's still naive, as it's just one level of nesting, but you can imagine that shopping carts will be part of bigger modules structure. From: github.com/oskardudycz/... I'm not saying that's best, but it's quite useful in many cases

All the links you gave me is a high priority on my reading list - thanks for all of it

Lol, unpeeling onion 😁

Pity that I gave this talk only twice on 4Dev and it wasn't recorded. Maybe some day 🙂