Ingresso diners al compte corrent.

Because Catalan usually omits the subject pronoun when it is clear from the verb form.

• Ingreso already tells you the subject is I
• So Ingreso diners al compte corrent naturally means I deposit money into the checking/current account

You can still say Jo ingresso diners al compte corrent, but jo would usually add emphasis or contrast.

Ingresso is the 1st person singular present indicative of ingressar.

So:

• (jo) ingresso = I deposit
• Depending on context, it can also correspond to English I am depositing

Catalan present tense often covers both a general action and a current action, depending on context.

Because in Catalan, a single s between vowels often sounds like z, while ss keeps the s sound.

So:

• ingresso has ss to preserve the correct pronunciation
• It comes from the stem ingress- plus the ending -o

This is a spelling/pronunciation issue, not a different word.

In Catalan, diners is the normal word for money, and it is grammatically plural.

So Catalan says:

• els diners
• molts diners
• pocs diners

Even though English uses singular money, Catalan uses plural diners. This is just one of those differences you have to learn as a vocabulary item.

Because here diners is being used in a general, indefinite sense: money, not the money.

So:

• Ingreso diners... = I deposit money...
• Ingreso els diners... = I deposit the money... (specific money already known in context)

Catalan often leaves out the article with an indefinite plural or mass-like direct object.

Al is the contraction of a + el.

So:

• al compte corrent = a el compte corrent

In English, that is usually translated as to the account or into the account.

This al marks the destination of the money.

It is a noun phrase made up of:

• compte = account
• corrent = current

So compte corrent literally means current account, which in American English is often checking account.

Notice that the adjective comes after the noun in Catalan, which is very common.

Yes, that is grammatically correct.

But in normal Catalan, the subject pronoun is often omitted, so Ingreso diners al compte corrent sounds more natural unless you want emphasis.

For example:

• Ingreso diners al compte corrent = neutral
• Jo ingresso diners al compte corrent, no ella = contrast/emphasis

Yes. This is a very normal Catalan order.

The structure is:

• Ingreso = verb
• diners = direct object
• al compte corrent = destination/complement

Since the subject jo is omitted, the sentence naturally starts with the verb. That is very common in Catalan.