"Nevím o tom klukovi, jejž jsem ráno našla ve své posteli, téměř nic."

Translation: I know almost nothing about the boy that I found in my bed in the morning.

[JBHayven]

Is "I don’t know almost anything..." incorrect? The recommended solution was "I don’t know hardly anything..." which on the other hand seems wrong to me (I’d say "I hardly know anything..."). I reported it via the report option but am not sure whether I was right so I’m asking here to find out :)

[svrsheque]

in my opinion you are correct on both accounts. the "don't know hardly anything" strikes me as non-standard english on the level of double negation.