Ever means 'at any time'. It is the opposite of never.

We generally use ever in questions.

Do you ever drink coffee?

Have you ever been to Paris?

Never means 'at no time'.

He has never visited me.

I'll never forget how kind he has been.

I never drink tea with milk.

Never and ever go immediately before the main verb.

Exceptions are the verb be and modal verbs.

I never eat meat.

Do you ever go cycling?

I am never late.

I can never remember his name.

You should never drink and drive.

When speaking about our past, we use the present perfect with ever and never.

I have never been to America.

Have you ever been to America?

It was the best wine I have ever tasted.