Namještaj kao što su ergonomska stolica i oslonac za noge pomaže.

Because the real subject of the sentence is namještaj (furniture), not the two examples.

• namještaj is a singular noun in Croatian
• so the verb is singular: pomaže = helps

The part kao što su ergonomska stolica i oslonac za noge just gives examples of that furniture.

So the structure is basically:

• Namještaj ... pomaže.
• Furniture ... helps.

Even though the examples are two separate items, the main noun controlling the verb is still namještaj.

Because su refers to the examples, which are plural as a group:

• ergonomska stolica
• i
• oslonac za noge

Together, those examples are plural, so Croatian uses su (are) inside the phrase kao što su = such as / like.

So the sentence has:

• pomaže → agrees with namještaj (singular)
• su → agrees with the listed examples (plural)

This is very natural in Croatian.

Here kao što su means such as or like when introducing examples.

So:

• Namještaj kao što su ergonomska stolica i oslonac za noge pomaže.
• Furniture such as an ergonomic chair and a footrest helps.

You can think of kao što su as a set phrase for giving examples.

Because the adjective must agree with the noun in gender, number, and case.

• stolica is feminine singular
• so the adjective must also be feminine singular
• therefore: ergonomska stolica

Compare:

• ergonomska stolica = feminine
• ergonomski stol = masculine
• ergonomsko sjedalo = neuter

This kind of agreement is very important in Croatian.

Literally it means something like support/rest for the legs/feet.

• oslonac = support, rest
• za = for
• noge = legs/feet

In context, the natural English translation is footrest.

So Croatian often uses a descriptive phrase where English may prefer one compact word.

Here noge is accusative plural after za.

• singular: noga = leg
• plural nominative: noge
• plural accusative: noge

For feminine nouns like noga, nominative plural and accusative plural often look the same, so the form is noge in either case.

In this phrase, za means for, and with that meaning it takes the accusative:

• oslonac za noge = a support/rest for the legs/feet

Normally, no. Namještaj works like furniture in English: it is usually treated as a mass/collective noun, not something you normally count with jedan.

So:

• namještaj = furniture
• not usually jedan namještaj = one furniture

If you want to count actual items, use words like:

• komad namještaja = a piece of furniture
• dva komada namještaja = two pieces of furniture

This is a very useful pattern to remember.

Mostly yes—you learn the gender of each noun as part of the word.

Some endings give clues:

• nouns ending in -a are often feminine → stolica
• nouns ending in a consonant are often masculine → oslonac

But there are exceptions, so it is best to learn each noun together with its gender.

This matters because adjectives and sometimes other words must agree with the noun:

• ergonomska stolica
• dobar oslonac

Only if the example is singular.

Use:

• kao što je = if one example follows
• kao što su = if multiple examples follow

Examples:

• Namještaj kao što je ergonomska stolica pomaže.

  • Furniture such as an ergonomic chair helps.

• Namještaj kao što su ergonomska stolica i oslonac za noge pomaže.

  • Furniture such as an ergonomic chair and a footrest helps.

So in your sentence, su is correct because there are two examples.

Yes. Croatian allows a few natural alternatives. For example:

• Ergonomska stolica i oslonac za noge pomažu.

  • The ergonomic chair and footrest help.
  • Here the subject is now plural, so the verb is pomažu.

• Namještaj poput ergonomske stolice i oslonca za noge pomaže.

  • Furniture like an ergonomic chair and a footrest helps.
  • This version uses poput instead of kao što su.

Your original sentence is perfectly natural, but it focuses first on the general category namještaj.

Yes, Croatian word order is more flexible than English word order, because case endings and agreement carry a lot of grammatical information.

Your sentence:

• Namještaj kao što su ergonomska stolica i oslonac za noge pomaže.

is natural and neutral.

But other orders may also be possible depending on emphasis. Croatian often moves elements around for style, focus, or rhythm.

For a learner, the safest approach is:

• keep the main subject near the beginning
• put the verb in a normal position
• use the original sentence as a model

So the given word order is a good standard one to learn from.

A rough guide:

• namještaj ≈ NAH-myeh-shtai
• oslonac ≈ OS-loh-nats

A few helpful points:

• nj sounds somewhat like the ny in canyon
• š sounds like sh
• j is pronounced like English y
• c is pronounced like ts

So:

• namještaj has the š = sh sound
• oslonac ends with -ac, where c = ts

Pronunciation details vary by speaker and region, but this is a good learner-level approximation.