1. We can use "besides" between two sentences.
I have paid a lot of money for the car. Besides
, I have paid for the insurance.
If I were you I would accept their offer. Besides
, there's no harm in trying.
2. we use "besides" at the end of a sentence as the word "anyway".
Tom is really very kind to me. He is a good colleague, besides.
I don't mind that you went to the concert yesterday. I don't like concerts, besides
3. We use "besides" followed by a noun / pronoun or Ving.
Tom, Jack and Celine are also coming.
I haven't eaten anything for about 7 hours; Besides
being extremely tired.
In breakfast I had two eggs, a slice of cheese and some bread;besides
a cup of coffee.
Don't confuse "besides" with "beside" as the latter one has a directional meaning.
He tiptoed into the room and stood beside
the wall not to wake up the baby.
My mother told me to go and sit beside