Over and above; separate or distinct from; in addition to; other than; else than
making an additional point; anyway; "I don't want to go to a restaurant; besides, we can't afford it"; "she couldn't shelter behind him all the time and in any case he wasn't always with her"
Besides is used to emphasize an additional point that you are making, especially one that you consider to be important. The house was too expensive and too big. Besides, I'd grown fond of our little rented house
Besides something or beside something means in addition to it. I think she has many good qualities besides being very beautiful There was only one person besides Ford who knew Julia Jameson. Besides is also an adverb. You get to sample lots of baked things and take home masses of cookies besides