Stalak za prijenosno računalo je na stolu.

Stalak means a stand, holder, or rack, depending on context. In this sentence, it means a stand for a laptop.

So stalak za prijenosno računalo = laptop stand.

Here za means for in the sense of intended purpose or meant for.

So:

• stalak za prijenosno računalo = a stand for a laptop
• literally: stand for portable computer

This is a very common Croatian pattern:

• šalica za kavu = cup for coffee
• torba za laptop = bag for a laptop
• stalak za knjige = stand/shelf for books

Because this is an adjective + noun combination:

• prijenosno = portable
• računalo = computer

Together they mean portable computer, i.e. laptop.

Croatian often forms expressions this way instead of using a single word.

Because prijenosno has to agree with računalo.

Računalo is:

• neuter
• singular

So the adjective also has to be neuter singular:

• masculine: prijenosni
• feminine: prijenosna
• neuter: prijenosno

Since računalo is neuter, the correct form is prijenosno računalo.

It actually is in the accusative, because za here takes the accusative. But računalo is a neuter singular noun, and for many neuter nouns the nominative and accusative forms are identical.

So:

• nominative: računalo
• accusative: računalo

That is why it looks unchanged.

Because this sentence describes location, not movement.

• na stolu = on the table → location
• na stol = onto the table → movement toward the surface

Croatian makes this distinction very clearly:

• Stalak je na stolu. = The stand is on the table.
• Stavljam stalak na stol. = I am putting the stand onto the table.

Because after na when it means location, Croatian uses the locative case.

So:

• basic form: stol = table
• locative singular: stolu = on the table / at the table, depending on context

That is why you get:

• na stolu

Je is the 3rd person singular present tense of biti (to be).

So:

• je = is

In this sentence:

• Stalak za prijenosno računalo je na stolu.
• The laptop stand is on the table.

Unlike in some languages, in standard Croatian you normally do include je in this kind of sentence.

No, Croatian word order is fairly flexible. The version here is a very neutral one.

• Stalak za prijenosno računalo je na stolu. = neutral
• Na stolu je stalak za prijenosno računalo. = puts more focus on where it is
• Na stolu je stalak. = often used if the location is the important part

The meaning stays basically the same, but the emphasis changes.

Because Croatian does not have articles like English a/an and the.

So stalak can mean:

• a stand
• the stand

Which one is meant depends on context.

The same is true for stol/stolu:

• a table
• the table

Croatian leaves that to context instead of using articles.

Yes. In everyday speech, many speakers would naturally say laptop.

For example:

• Stalak za laptop je na stolu.

That sounds natural and common in conversation.
Prijenosno računalo is more fully Croatian and can sound a bit more formal or careful.

Because Croatian expresses purpose here with za + accusative, not with the genitive.

• stalak za prijenosno računalo = stand for a laptop

Using prijenosnog računala would suggest a different relationship, not the normal meant for meaning.

So if you want to say a stand designed to hold a laptop, za + accusative is the normal structure.

A simple pronunciation guide:

• Stalak ≈ STAH-lak
• za ≈ zah
• prijenosno ≈ pree-ye-NOSS-no
• računalo ≈ rah-choo-NAH-lo
• je ≈ yeh
• na ≈ nah
• stolu ≈ STOH-loo

A few useful sound notes:

• j is pronounced like English y
• č sounds like ch in church
• ć is a softer sound than č, though many learners do not master the difference right away

Yes. It is grammatical and natural.

That said, in very everyday speech many people might prefer a slightly shorter version such as:

• Stalak za laptop je na stolu.

But the original sentence is perfectly correct and clear, especially for learning vocabulary and grammar.