know what's what

US /noʊ wʌts wʌt/
UK /noʊ wʌts wʌt/
"know what's what" picture
1.

wissen, was Sache ist, Bescheid wissen

to have a good understanding of a situation or of how things work

:
She's been in this business for years, so she really knows what's what.
Sie ist seit Jahren in diesem Geschäft, also weiß sie wirklich, was Sache ist.
You need to spend some time learning the ropes if you want to know what's what around here.
Du musst etwas Zeit damit verbringen, die Grundlagen zu lernen, wenn du hier wissen willst, was Sache ist.