Uglavnom koristim Portal eUprava.

In this sentence, uglavnom means mostly / mainly / for the most part. It tells you that this is the service the speaker uses most of the time.

In other contexts, uglavnom can also mean generally speaking, so the exact English translation depends on the sentence.

Serbian often leaves out subject pronouns because the verb ending already shows who is doing the action.

Here, koristim already means I use or I am using, so ja is not necessary.

You can add ja for emphasis: Ja uglavnom koristim Portal eUprava. This would sound more like I mostly use Portal eUprava.

Koristim is the 1st person singular present tense of koristiti = to use.

Present tense forms:

• ja koristim = I use
• ti koristiš = you use
• on/ona koristi = he/she uses
• mi koristimo = we use
• vi koristite = you use
• oni/one koriste = they use

In this sentence, it expresses a habitual action: I mainly use...

It is the direct object of koristim, so it is in the accusative case.

However, portal is an inanimate masculine noun, and for most inanimate masculine singular nouns, the accusative looks the same as the nominative.

So:

• nominative: portal
• accusative: portal

That is why you do not see a different ending here.

Also, eUprava is part of the name, so the whole title stays in its standard written form.

Here, Portal eUprava is being treated as an official name or brand name, so capitalization is used.

In less official writing, you may also see portal eUprava, where portal is just the common noun and eUprava is the specific name. The sentence you were given looks like official-style writing.

Because Serbian has no articles. There is no normal everyday word equivalent to English a/an/the.

So Serbian simply says: koristim Portal eUprava

English has to choose something like I use Portal eUprava or I use the eUprava portal, depending on context.

Yes. Serbian word order is more flexible than English word order.

Uglavnom koristim Portal eUprava is natural and neutral.

You could also hear:

• Koristim uglavnom Portal eUprava
• Portal eUprava uglavnom koristim

But those versions shift the emphasis a little. The original sentence is the most straightforward.

Koristiti is normally imperfective.

That matters because the sentence describes a usual or repeated action: the speaker generally uses this portal. Imperfective verbs are the normal choice for:

• habits
• repeated actions
• ongoing actions
• general statements

So koristim fits very naturally here.

It is usually read as e-uprava, with the e pronounced separately and then uprava.

A rough English-friendly guide would be:

• uglavnom ≈ oo-GLAHV-nom
• koristim ≈ KOH-ri-steem
• Portal ≈ POR-tal
• eUprava ≈ eh-OO-pra-va

That is only an approximation, but it is close enough for a beginner.

Yes. Serbian uses both Latin and Cyrillic scripts.

In Cyrillic, the sentence is: Углавном користим Портал еУправа.

The meaning and grammar stay the same.