0 some matters, facts, or information: --
I'm having trouble paying attention - I have a thing or two on my mind.
Why don't you ask Andrew about it? He knows a thing or two about (= has some knowledge of) computers.
She thinks she knows everything about raising children, but I could tell her a thing or two (= some information she does not know).
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Vi kan slutföra det steg för steg hur lång vägen än är och den kan inte slutföras hur kort vägen än är om du inte ens markerar ditt fotavtryck.