Conjunctions
and - to add a fact or idea
I saw a man and a woman
or - choice
Would you like coffee or tea?
but - contrast
I like fruit, but I don't like oranges.
so - resultI went to bed late so now I am tired.
because - why / reason
I like school because I get to see my friends.
because:
in the middle of the sentence -> no comma
At the beginning-> comma after the first clause