This is the 308th most frequent Hungarian word.
emellett
"Emellett" means "besides" or "in addition to this" in English.
Here, 'emellett' is used in the sense of 'besides' or 'moreover', adding an additional quality to the subject's description.
Ő nagyon szorgalmas, és emellett mindig megértő.
They are very diligent, and besides, always understanding.
Here, 'emellett' indicates 'in addition to', adding another activity to what the subject enjoys doing.
Szeret olvasni, emellett sportolni is szokott.
They like reading, and in addition, they also usually do sports.
Here, 'emellett' is used in its literal spatial sense, meaning 'next to this' or 'beside this'.