Kapetan je ovde.

Je means is. It is the 3rd person singular present tense form of biti, which means to be.

So:

• kapetan = captain
• je = is
• ovde = here

Serbian does not have articles like English a and the.

So kapetan can mean either:

• the captain
• a captain

The exact meaning depends on context. In many situations, this sentence will naturally be understood as the captain is here.

Because je is an unstressed clitic in Serbian. Clitics usually go in the second position of the sentence or clause.

That is why Kapetan je ovde sounds natural:

• first element: Kapetan
• second-position clitic: je
• rest: ovde

A sentence normally does not start with je by itself in this kind of statement.

Yes, you can. Ovde je kapetan is grammatical.

The difference is mainly emphasis:

• Kapetan je ovde = neutral statement
• Ovde je kapetan = puts more focus on here

In both versions, je stays in second position.

Kapetan is in the nominative singular.

It is nominative because it is the subject of the sentence: the captain is the one being talked about.

Also:

• kapetan is a masculine noun
• singular form: kapetan
• plural form: kapetani

No. Ovde is an adverb, not a noun or adjective, so it does not change for case, gender, or number.

It simply means here.

A simple pronunciation guide is:

kah-peh-TAHN yeh OV-deh

A few helpful points:

• j is pronounced like English y in yes
• e is usually pronounced clearly, like e in met, but a bit tenser
• Serbian spelling is quite phonetic, so words are usually pronounced much as they are written

So:

• je sounds like ye
• ovde sounds roughly like OV-de

They mean the same thing: here.

The difference is regional/standard variety:

• ovde is the usual Ekavian form
• ovdje is the usual Ijekavian form

Both are correct, but ovde is the form used in your sentence.

No. You do not need a pronoun here.

Serbian often leaves out subject pronouns when they are not needed. In this sentence, the subject is already expressed by the noun kapetan, so adding on would usually be unnecessary.

So the natural sentence is simply:

Kapetan je ovde.

No, but it is one of the most common and direct ways.

You may also hear tu, which can mean there or sometimes here, depending on context. Very roughly:

• ovde = here, near the speaker
• tu = there / right there, often near the listener or a known place

For a learner, ovde is the clearest match for English here in this sentence.