Aggiorno il mio curriculum prima di inviarlo.

Aggiorno is the first-person singular present indicative of aggiornare, meaning to update.

So:

• aggiorno = I update / I am updating

In Italian, the present tense often covers both:

• a habitual action: I update my CV before sending it
• an action happening right now: I’m updating my CV before sending it

Italian uses the present tense more broadly than English does.

Italian often drops the subject pronoun because the verb ending already shows who is doing the action.

• aggiorno clearly means I update
• so io is not necessary

You could say Io aggiorno il mio curriculum..., but that usually adds emphasis or contrast, for example:

• Io aggiorno il mio curriculum, lui no.
  • I update my CV, he doesn’t.

In a neutral sentence, leaving out io is more natural.

In Italian, a possessive adjective like mio usually goes together with the definite article:

• il mio curriculum
• la mia macchina
• i miei libri

So il mio curriculum is the normal pattern.

A famous exception is with many singular family-member nouns, where the article is often omitted:

• mia madre
• mio fratello

But curriculum is not a family noun, so il stays.

In Italian, curriculum usually means CV or résumé, often as a short form of curriculum vitae.

So:

• il curriculum
• il curriculum vitae

In everyday Italian, people may also simply say:

• il CV

A useful note: curriculum is treated as a masculine noun, which matters later when you see lo.

Prima di means before when it is followed by an infinitive.

Pattern:

• prima di + infinitive

Examples:

• prima di uscire = before going out
• prima di mangiare = before eating
• prima di inviarlo = before sending it

This structure is used when the subject of both actions is the same. In this sentence, the same person:

• updates the CV
• sends it

So prima di inviarlo is exactly what Italian normally uses here.

Because lo is a direct object pronoun meaning it, and in Italian, object pronouns are often attached to an infinitive.

So:

• inviare = to send
• lo = it
• inviarlo = to send it

This is very common:

• farlo = to do it
• vederlo = to see it
• comprarlo = to buy it

You could think of inviarlo as send-it, combined into one word.

When a pronoun is attached to an infinitive in Italian, the final -e of the infinitive is dropped.

So:

• inviare + lo
• becomes inviarlo

The same thing happens with other infinitives:

• fare + lo → farlo
• vedere + la → vederla
• scrivere + ti → scriverti

So inviarlo is the regular form.

Lo refers back to il mio curriculum.

Since curriculum is:

• masculine
• singular

the correct direct object pronoun is lo.

Italian direct object pronouns match the noun they replace:

• lo = masculine singular
• la = feminine singular
• li = masculine plural
• le = feminine plural

So:

• Aggiorno il mio curriculum prima di inviarlo.
• I update my CV before sending it.

If the noun were feminine, you would use la instead.

Yes. That is completely correct.

Italian word order is often flexible, especially with adverbial phrases like prima di inviarlo.

Both of these work:

• Aggiorno il mio curriculum prima di inviarlo.
• Prima di inviarlo, aggiorno il mio curriculum.

The difference is mainly focus:

• putting prima di inviarlo first emphasizes the time sequence a little more
• putting it at the end sounds very natural and neutral

Yes, but it would mean something slightly different grammatically.

• prima di + infinitive is used when the subject is the same
• prima che + verb is used when you have a full clause, often with a possibly different subject

For example:

• Aggiorno il mio curriculum prima di inviarlo.
  • same subject: I update it before sending it

Compare with:

• Aggiorno il mio curriculum prima che tu lo invii.
  • I update my CV before you send it

So in your sentence, prima di inviarlo is the natural choice because the same person does both actions.