Voy a guardar el documento en la carpeta antes de cerrar sesión.

Because ir a + infinitive is a very common Spanish future construction.

• voy = I go / I am going
• a guardar = to save

Together, voy a guardar means I’m going to save.

It works just like English to be going to + verb:

• Voy a comer = I’m going to eat
• Voy a llamar = I’m going to call

So in this sentence, voy a guardar el documento means I’m going to save the document.

Yes. Guardaré el documento en la carpeta antes de cerrar sesión is grammatically correct.

The difference is mainly in style and nuance:

• Voy a guardar... = very common in everyday speech, often sounds more immediate or planned
• Guardaré... = simple future, also correct, sometimes sounds a bit more formal, more definite, or more written depending on context

In many situations, both are possible.

Here, guardar means to save.

Depending on context, guardar can also mean:

• to keep
• to store
• to put away

In computer language, guardar un documento usually means to save a document.

So:

• Guardar el documento = Save the document

Spanish uses articles much more often than English.

So where English might say:

• save document in folder

Spanish normally says:

• guardar el documento en la carpeta

The articles el and la often sound natural even when English would leave them out, especially when talking about a specific item already understood in context.

Also:

• documento is masculine → el documento
• carpeta is feminine → la carpeta

Because en is the normal preposition with guardar when something is being placed or saved in a location.

• en la carpeta = in the folder

In Spanish, guardar algo en... is the usual pattern:

• Guardar el archivo en una carpeta
• Guardar la foto en el móvil

Using a la carpeta would sound unnatural here.

Yes. In Spain, carpeta is the normal word for a computer folder.

It can also mean a physical folder for papers, so the word works in both digital and physical contexts.

In this sentence, the computer meaning is clear because of guardar el documento and cerrar sesión.

Because after antes de, Spanish uses the infinitive when the subject is the same as the main verb.

Here, the subject is I in both actions:

• Voy a guardar... = I’m going to save...
• cerrar sesión = I log out

Since it is the same person doing both things, Spanish uses:

• antes de + infinitive

So:

• antes de cerrar sesión = before logging out

If the subject changes, then Spanish usually uses antes de que + subjunctive:

• Voy a guardar el documento antes de que cierres sesión
  = I’m going to save the document before you log out

Cerrar sesión means to log out or to sign out.

It is a fixed expression in Spanish, especially in technology and websites.

Examples:

• He cerrado sesión = I logged out
• No cierres sesión todavía = Don’t log out yet
• Antes de cerrar sesión = Before logging out

Literally, it is something like to close the session, but in normal English the natural translation is log out or sign out.

Because cerrar sesión is an established idiomatic expression. In this meaning, Spanish usually does not use an article or possessive.

So the normal forms are:

• iniciar sesión = to log in
• cerrar sesión = to log out

Not usually:

• cerrar la sesión
• cerrar mi sesión

Those versions might appear in unusual or very specific contexts, but for ordinary computer use, cerrar sesión is the standard phrase.

Because the stress falls on the last syllable: se-SIÓN.

Spanish spelling rules say that words stressed on the last syllable normally need a written accent if they end in n, s, or a vowel.

Since sesión:

• ends in n
• is stressed on the last syllable

it needs the accent mark:

• sesión

Yes, Spanish word order is fairly flexible, but some orders sound more natural than others.

The original sentence:

• Voy a guardar el documento en la carpeta antes de cerrar sesión

is very natural.

You could also say:

• Antes de cerrar sesión, voy a guardar el documento en la carpeta.

This puts more emphasis on before logging out.

But some changes can create awkwardness or ambiguity. For example, moving en la carpeta to the end may make the sentence harder to process:

• Voy a guardar el documento antes de cerrar sesión en la carpeta.

That version sounds odd because en la carpeta seems too far from guardar el documento.

Usually it means I’m going to save.

Sometimes ir a + infinitive can suggest that something is about to happen, but it does not always mean immediately. It can simply express an intended future action.

So in this sentence:

• Voy a guardar el documento...

the safest translation is:

• I’m going to save the document...

If Spanish wanted to strongly emphasize right now / just about to, it would usually rely on context or add other words.

A very natural English version would be:

• I’m going to save the document in the folder before logging out.

You could also say:

• I’m going to save the document to the folder before signing out.

In English, to the folder is also common in computer contexts, but in Spanish the usual preposition here is still en:

• en la carpeta