The words besides, except and apart from are sometimes confused. Here’s a note on how to use each of these properly:
‘besides’ usually adds; it is like saying ‘with’ or ‘plus.’
Besides English and French, he can also speak Spanish. [He speaks three languages]
‘except’ substracts; it is like saying ‘without’ or ‘minus.’
I have watched all of Bruce Lee’s movies, except ‘The Big Boss.’
‘apart from’ can be used in both senses.
Apart from English, he speaks French and Spanish.
I have watched all of Bruce Lee’s movies apart from ‘The Big Boss.’
After ‘no’, ‘nobody’, ‘nothing’ or similar negative words, the three expressions can all have the same meaning.
He has no one except/besides/apart from his mother.