O zíper da minha bolsa está difícil de fechar, então vou levar outra.

Because zíper is a masculine noun in Brazilian Portuguese, so it takes o.

• o zíper = the zipper
• um zíper = a zipper

Grammatical gender in Portuguese does not always match any logical rule, so this is something you mostly memorize with the noun.

Also, zíper is a very common Brazilian Portuguese word, borrowed from zipper in English.

Da is a contraction of de + a.

So:

• de = of / from
• a bolsa = the bag
• de + a bolsa = da bolsa

In da minha bolsa, the full idea is basically of my bag.

Brazilian Portuguese very commonly uses the article before possessives:

• a minha bolsa
• o meu carro
• a sua casa

So da minha bolsa is the natural form in everyday speech.

In Brazilian Portuguese, it is very common to use a definite article before possessives:

• a minha bolsa
• o meu celular
• a sua mochila

English does not do this, so it can feel strange at first.

You may also hear forms without the article, such as minha bolsa, and those are not wrong. But in Brazil, using the article is extremely common and often sounds more natural in everyday speech.

Here, bolsa means something like bag, purse, or handbag, depending on context.

Common related words:

• bolsa = purse / handbag / bag
• mochila = backpack
• mala = suitcase
• sacola = shopping bag / plastic or paper bag

So in this sentence, bolsa is most likely a personal bag or purse.

Está difícil suggests a current condition or temporary situation.

So:

• O zíper ... está difícil de fechar = the zipper is being difficult / is hard to close right now

If you said é difícil, it would sound more like a general characteristic:

• Esse tipo de zíper é difícil de fechar. = This kind of zipper is hard to close.

In this sentence, the speaker is talking about the zipper’s condition at the moment, so está is the more natural choice.

In Portuguese, it is very common to use the pattern:

adjective + de + infinitive

Examples:

• difícil de entender = hard to understand
• fácil de usar = easy to use
• bom de comer = good to eat
• impossível de abrir = impossible to open

So:

• difícil de fechar = hard to close

This structure is extremely useful and common.

Usually, with this structure, de is the normal and expected choice.

So difícil de fechar sounds natural.

Without de, difícil fechar would generally sound incomplete or unnatural in standard Portuguese.

A different natural structure would be:

• É difícil fechar o zíper.
• O zíper está difícil de fechar.

Both are correct, but the sentence you were given focuses on the zipper itself.

In Portuguese, fechar is the normal verb for closing many things, including a zipper, a bag, a door, a window, etc.

Examples:

• fechar a porta = close the door
• fechar a janela = close the window
• fechar a bolsa = close the bag
• fechar o zíper = close the zipper

In everyday speech, Brazilians may also talk about whether a zipper sobe or desce:

• O zíper não sobe.
• O zíper emperrou.

But fechar is perfectly normal here.

Então means something like so, then, or therefore, depending on context.

Here it connects cause and result:

• zipper is hard to close
• então = so
• I’ll take another one

It is a very common connector in spoken and written Portuguese.

Other possible connectors in similar contexts:

• por isso = for that reason / because of that
• por isso vou levar outra
• assim can sometimes work in other contexts, but not as directly here

Because Portuguese, like English, can leave out a noun when it is already understood from context.

Here, outra means another one, and the missing noun is bolsa.

So:

• vou levar outra = I’m going to take another one
• vou levar outra bolsa = I’m going to take another bag

Both are correct. The shorter version sounds very natural because bolsa has already been mentioned.

Because outra refers back to bolsa, and bolsa is feminine.

Agreement matters in Portuguese:

• a bolsa → outra
• o carro → outro

Examples:

• Vou levar outra bolsa.
• Vou comprar outro carro.

Even when the noun is omitted, the adjective/pronoun still has to match the implied noun:

• vou levar outra = another bag
• vou comprar outro = another car

Yes. Vou levar is the very common ir + infinitive future structure in Portuguese.

It literally looks like:

• vou = I go / I am going
• levar = to take

But together it means:

• I’m going to take
• or simply I’ll take

This is one of the most common ways to talk about the future in Brazilian Portuguese.

Compare:

• vou levar = I’m going to take / I’ll take
• levarei = I will take

Both are correct, but vou levar is much more common in everyday Brazilian speech.

Levar and trazer depend on direction.

• levar = to take something away from where the speaker is, or to another place
• trazer = to bring something toward where the speaker is, or toward the reference point

So vou levar outra means the speaker will take another bag along with them.

If you said vou trazer outra, it would suggest bringing another bag to the place being discussed.

English speakers often find this tricky, because the choice depends on perspective.

A simple approximation is:

• zíper ≈ ZEE-per

A few helpful notes:

• The stress is on the first syllable: ZÍ-per
• The z at the beginning sounds like a z in English
• The final r in Brazilian Portuguese is usually not pronounced like a strong English r

And fechar is roughly:

• fe-SHAR or fe-SAR, depending on accent

The exact pronunciation varies by region, but that approximation is good enough for a learner starting out.