Je connais le code confidentiel de ma carte bancaire.

In this sentence, connaître is the natural verb.

A useful rule is:

• savoir = to know a fact, to know how to do something, or to know that / what / where / when...
• connaître = to be familiar with a person, place, or thing

With a noun like le code confidentiel, French normally prefers connaître:

• Je connais le code.
• Tu connais ton code ?

If you want to use savoir, French usually needs a full clause:

• Je sais quel est le code.

So Je connais le code confidentiel... sounds much more natural than Je sais le code confidentiel....

Yes. In this context, code confidentiel is the code you use with a bank card, so it corresponds to PIN in English.

Literally, it means something like confidential code, but that literal wording is not how English usually says it. In real-life translation, PIN is the best match.

In everyday French, people may also simply say:

• le code
• sometimes le code secret

because the context already makes it clear.

French usually needs an article before nouns, much more often than English does.

Here, le code confidentiel means the PIN / the confidential code. The phrase de ma carte bancaire then specifies which one.

So the structure is:

• le code confidentiel = the PIN
• de ma carte bancaire = of my bank card

Together: the PIN of my bank card

English often avoids the in similar cases, but French normally keeps it.

Because carte is a feminine noun in French.

So:

• mon = my + masculine singular noun
• ma = my + feminine singular noun
• mes = my + plural noun

Examples:

• mon livre = my book
• ma carte = my card
• mes cartes = my cards

So ma carte bancaire is correct because carte is feminine.

Because in French, many adjectives come after the noun.

So:

• un code confidentiel
• not un confidentiel code

This is very normal in French. Some common adjectives do come before the noun, but most descriptive adjectives, including confidentiel, usually come after it.

So code confidentiel follows a standard French word order:

• noun first
• adjective second

French does not use the English-style apostrophe-s possession structure.

Instead, it normally uses de:

• le code de ma carte bancaire = the code of my bank card
• la couleur de la voiture = the color of the car

So de is the normal way to express this relationship.

In other words, where English can say:

• my bank card's PIN

French says:

• le code confidentiel de ma carte bancaire

Not exactly.

Carte bancaire is a broad everyday term for a bank card used for payments or cash withdrawals. In many situations, it is closer to bank card or debit card than to credit card.

French does also have carte de crédit, but that is not always the most general or natural choice.

So in this sentence, carte bancaire is a normal, idiomatic way to talk about the card linked to your bank account.

Yes, absolutely.

That sounds natural, and in many situations it is what people would actually say. Since a bank card usually has one relevant code, le code is often enough.

So both of these work:

• Je connais le code confidentiel de ma carte bancaire.
• Je connais le code de ma carte bancaire.

The version with confidentiel is a bit more explicit and formal.

You can, but it means something slightly different.

• Je connais le code... = I know the PIN
• J’ai le code... = I have the PIN

J’ai may suggest that you possess it somehow, for example written down somewhere, on a letter, or in a message. It does not focus on knowing it from memory.

So if you want to say that you remember it or know what it is, Je connais le code... is the better choice.

A careful pronunciation is roughly:

Je connais le code confidentiel de ma carte bancaire
IPA: /ʒə kɔ.nɛ lə kod kɔ̃.fi.dɑ̃.sjɛl də ma kaʁt bɑ̃.kɛʁ/

A rough English-style guide could be:

zhuh ko-NEH luh kohd kon-fee-dahn-syEL duh ma kart ban-KEHR

A few helpful points:

• Je sounds like zhuh
• connais sounds like ko-NEH
• the final -s in connais is silent
• confidentiel has a nasal sound in -dɑ̃-
• bancaire ends roughly like kehr

As always, the English-style guide is only approximate, but it can help you get started.