open -a "Finder" . - open Finder in the current directory.
Standard apps usually just need the name, like Finder and Safari but you can also specify the path "/Applications/DifferentFinder.app"
Finder is pretty good, and it's handy to be able to open it from the terminal. But I find it super annoying it litters everything with .DS_Store files and there is no way to turn that off, except for external and network drives. Aside from, obviously, using a different file manager. Very un-Apple.
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You can also `open -R file` to select that file in Finder.
you can just
open .
unless you've reconfigured something else to open directories, which most people haven't.