Begitu saya sampai di minimarket, saya mengambil troli kecil karena mau membeli banyak barang.

Here begitu means as soon as or once.

So:

Begitu saya sampai di minimarket, ...
= As soon as I arrived at the minimarket, ...

In this use, begitu introduces something that happens immediately after another action.

A very common alternative is:

Sesampainya saya di minimarket... or more naturally Sesampainya di minimarket...
But begitu is simpler and very common in everyday Indonesian.

Indonesian often repeats the subject when it appears in both clauses, especially if it helps make the sentence clear.

So in:

Begitu saya sampai di minimarket, saya mengambil troli kecil...

the first saya is the subject of sampai
and the second saya is the subject of mengambil.

In English, we also do this:

As soon as I arrived..., I took...

You usually cannot just say:

Begitu saya sampai di minimarket, mengambil troli kecil...

because that sounds incomplete or awkward in standard Indonesian.

Both can be heard, but sampai di minimarket is the clearer and more standard form for many learners.

• sampai di + place = arrive at + place

So:

sampai di minimarket = arrive at the minimarket

The preposition di marks the location.

You may also hear:

sampai ke minimarket

but sampai di is especially common when emphasizing arrival at a place.

Yes, minimarket is a common borrowed word in Indonesian. It refers to a small convenience store or small self-service grocery store.

Examples in Indonesia would be the kind of store like Indomaret or Alfamart.

So minimarket is a normal everyday Indonesian word, even though it comes from English.

Yes, mengambil literally means to take, pick up, or get.

In this sentence:

saya mengambil troli kecil
it means something like:

• I took a small cart
• I got a small trolley

This is natural in Indonesian. Even if in English you might say I grabbed a cart or I got a cart, Indonesian commonly uses mengambil.

Good question. Both are used for shopping, but they are different things:

• troli = shopping cart / trolley, usually with wheels
• keranjang = basket

So:

troli kecil = a small wheeled cart
keranjang kecil = a small basket

If the store has both baskets and carts, troli specifically means the wheeled one.

In Indonesian, adjectives usually come after the noun.

So:

• troli kecil = small trolley
• barang banyak would literally be goods many, though in this sentence the more natural structure is banyak barang

The usual pattern is:

noun + adjective

Examples:

• rumah besar = big house
• tas merah = red bag
• troli kecil = small trolley

Mau often means want to, but in everyday Indonesian it can also mean something like going to, planning to, or about to, depending on context.

Here:

karena mau membeli banyak barang
means:

• because I wanted to buy a lot of items
• because I was going to buy a lot of things

In this sentence, mau suggests intention or plan.

So it is not only a strong emotional want. It often works more like intend to.

Because the subject is already understood from the earlier clause.

The full meaning is:

... saya mengambil troli kecil karena (saya) mau membeli banyak barang.

The second saya before mau membeli is optional because Indonesian often omits subjects when they are already obvious from context.

So both are possible:

• ... karena mau membeli banyak barang
• ... karena saya mau membeli banyak barang

The version without the second saya sounds smooth and natural.

Both are possible, but they have different levels of formality and structure.

• beli = base form, common in casual speech
• membeli = verb with the meN- prefix, more standard and slightly more formal

So:

• mau beli banyak barang = very natural in conversation
• mau membeli banyak barang = also natural, a bit more careful or standard

Both mean the same thing here.

With quantities like banyak (many / much / a lot of), the quantity word usually comes before the noun.

So:

• banyak barang = many items / a lot of things

This is different from ordinary adjectives like kecil, which usually come after the noun.

Compare:

• troli kecil = small trolley
• banyak barang = many items

So banyak behaves more like a quantifier than a regular adjective.

Yes. Barang literally often means goods, items, or objects, but in shopping contexts it very naturally means items or things you are buying.

So:

membeli banyak barang
can mean:

• buy a lot of items
• buy a lot of things
• buy lots of groceries/products depending on context

It does not have to sound as formal as goods in English.

Yes, but the meaning changes slightly.

• karena = because
• jadi = so / therefore

Original: ... saya mengambil troli kecil karena mau membeli banyak barang.
= ... I took a small trolley because I wanted to buy many items.

If you use jadi: ... saya mau membeli banyak barang, jadi saya mengambil troli kecil.
= ... I wanted to buy many items, so I took a small trolley.

Both are natural, but:

• karena gives the reason after the action
• jadi gives the result after the reason

Yes, it is natural and easy to understand.

A few everyday variations might be:

• Begitu sampai di minimarket, saya mengambil troli kecil karena mau beli banyak barang.
• Setelah sampai di minimarket, saya mengambil troli kecil karena mau membeli banyak barang.
• Sesampainya di minimarket, saya mengambil troli kecil karena ingin membeli banyak barang.

These are all natural, with small differences:

• begitu = as soon as
• setelah = after
• mau = want to / going to
• ingin = want to, a bit more formal or deliberate

So the original sentence is perfectly fine, and it sounds like normal standard Indonesian.