Know Your Stuff
know your stuff (also UK old-fashioned know your onions informal) to have good practical skills and knowledge in a particular activity or subject.
كهسێكی شارهزار وبهتوانا و زیرهكه (كاتێك بتهوێ ستایشی كهسێك بكهی).
She's an excellent teacher - she really knows her stuff.
مامۆستایهكی نایابه، زۆر شارهزا و بهتوانا و زیرهكه.
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