You use except when you mention the only thing that is not included in a statement: I like all sports except football.

used before you mention the only thing or person about which a statement is not true synonym apart from We work every day except Sunday.

to not include someone or something except somebody/something The sanctions ban the sale of any products excepting medical supplies and food.

used before you mention something that makes a statement not completely true. synonym apart from the fact that except (that).

used after being rude or critical about somebody to say that the people you are talking to are not included in the criticism.

​except (that)… used before you mention something that makes a statement not completely true. I didn't tell him anything except that I needed the money.

There are eight meanings listed in OED's entry for the verb except, five of which are labelled obsolete. See 'Meaning & use' for definitions, usage, and ...

not including; but not: The museum is open daily except Monday(s). The government has few options except to keep interest rates high.

​except for; apart from. The sanctions ban the sale of any products excepting medical supplies and food. Join us. Join our community to access the latest ...

a person or thing that is not included in a general statement. Most of the buildings in the town are modern, but the church is an exception.