Evlilik benim için önemli.

In Turkish, the verb to be is often not stated in the present tense, especially in third-person sentences like this one.

So:

Evlilik benim için önemli.
literally looks like: Marriage for me important.
but it naturally means: Marriage is important to me / for me.

You can add -dir for a more formal or emphatic tone:

Evlilik benim için önemlidir.

In everyday speech, the version without -dir is much more common.

Because after için, personal pronouns usually appear in a special form:

• benim için = for me
• senin için = for you
• onun için = for him/her/it
• bizim için = for us
• sizin için = for you (plural/formal)
• onların için = for them

So ben için is not correct here.

A useful thing to notice: with regular nouns, Turkish usually does not add that extra ending:

• Ali için = for Ali
• çocuklar için = for the children

But with pronouns, you normally get forms like benim için.

İçin is a postposition that often means for, for the sake of, or sometimes because of, depending on context.

In this sentence, benim için means something like:

• for me
• to me
• from my point of view / in my case

So the sentence means that marriage is important in relation to me, not necessarily to everyone.

Because the normal Turkish pattern for important to someone is:

X için önemli = important for/to X

So:

• benim için önemli = important to me
• senin için önemli = important to you

Bana önemli is not the normal way to say this.

A related phrase is:

bence önemli = important in my opinion

That is different from benim için önemli:

• benim için önemli = it matters to me personally
• bence önemli = I think it is important

Those can overlap, but they are not exactly the same.

Yes. Turkish word order is flexible, and changing it often changes emphasis rather than the basic meaning.

The neutral version is:

Evlilik benim için önemli.

You could also say:

Benim için evlilik önemli.

This puts more focus on benim için or sets up as for me.

In many cases, the word just before the end or the final position can carry special emphasis, so word order is something Turkish uses for nuance.

Still, for a learner, Evlilik benim için önemli is a very natural default sentence.

Because Turkish often uses a bare noun when talking about something in a general or abstract sense.

Here, evlilik means marriage as a concept or institution.

So:

• evlilik = marriage (in general)
• bir evlilik = a marriage (one marriage)

If you said Bir evlilik benim için önemli, that would sound more like A marriage is important to me, which is less natural unless a specific context is involved.

Önemli is an adjective meaning important or significant.

In this sentence, it is used as a predicate adjective:

• Evlilik = subject
• benim için = for me
• önemli = important

So the structure is basically:

Marriage — for me — important.

The same word can also directly describe a noun:

• önemli bir karar = an important decision
• önemli bir konu = an important topic

Yes. That is correct.

The ending -dir adds a tone that can feel:

• more formal
• more definite
• more written or textbook-like
• sometimes more emphatic

So:

• Evlilik benim için önemli. = normal, everyday
• Evlilik benim için önemlidir. = more formal/assertive

Both are grammatical.

Benim is the genitive form of ben.

You may already know benim as meaning my, but here it is part of the fixed pattern with için:

• benim için = for me

So even though benim often appears in possessive structures, here it is not directly showing possession of a noun. It is part of the expression used with için.

Not with the same meaning.

• evlilik = marriage
• evlenmek = to get married

So:

Evlilik benim için önemli.
means Marriage is important to me.

If you used evlenmek, the meaning would shift toward getting married as an action:

Evlenmek benim için önemli.
= Getting married is important to me.

That is also possible Turkish, but it is not exactly the same idea.

By itself, it usually sounds like marriage as an idea or life choice is important to the speaker.

It does not automatically mean a specific marriage.

If you wanted to talk about a specific marriage, Turkish would usually give more context, for example:

• Bu evlilik benim için önemli. = This marriage is important to me.
• Evliliğimiz benim için önemli. = Our marriage is important to me.

So the bare evlilik here most naturally suggests the general concept of marriage.