I need more information about transplanting indoor plants outdoors

A customer has a question and I hope we can get some opinions on it, thanks

I need more information about transplanting indoor plants outdoors, specifically -
Hole preparation in various soil types.
There’s a lot of clay strata in many places.
How large should a prepared hole be, if there’s high clay content?
Drainage is, of course, of chief concern.

Add fluffing…perlite, planting media …stuff to loosen n fluff soil so roots can grow easy. Expand to size you want roots to grow