A tapasztalt csapatnak sok készsége van.

A is the definite article, like the in English.

So A tapasztalt csapatnak means the experienced team in the grammatical form needed by the sentence.

A useful thing to notice: the case ending goes on the noun, not on the article. That is why you get a csapatnak, not a changed form of a.

Because Hungarian marks the possessor in this kind of have sentence with -nak/-nek.

The pattern is:

X-nak/-nek Y-a/-e van = X has Y

So here:

• a tapasztalt csapatnak = to/for the experienced team
• sok készsége van = many skills exist for it

Together, that gives the normal Hungarian way to say the experienced team has many skills.

The ending is -nak here, not -nek, because csapat has back vowels, and Hungarian follows vowel harmony.

Hungarian usually does not use a direct equivalent of English have in ordinary possession sentences.

Instead, it uses an existence structure:

• A csapatnak készsége van
  literally something like To the team, a skill exists

This sounds strange in English, but it is completely normal in Hungarian.

So when English says has, Hungarian often says there is / exists plus:

• the possessor in -nak/-nek
• the possessed thing with a possessive ending

That is a very common question.

Hungarian often omits van in simple present-tense sentences with noun or adjective predicates:

• A csapat tapasztalt. = The team is experienced.

But in existence and possession sentences, van is normally kept:

• A csapatnak sok készsége van.

So here van is not just a plain is; it is part of the possession structure.

The base word is készség.

The form készsége contains a possessive suffix meaning his/her/its:

• készség = skill
• készsége = his/her/its skill

In this sentence, the possessor is the team, so in English it would be its skill.

That may seem odd at first, because English does not usually show possession on the noun in a sentence like the team has skills, but Hungarian does.

So the sentence combines:

• possessor: a tapasztalt csapatnak
• possessed noun: készsége
• existence verb: van

Because after numbers and many quantity words, Hungarian usually uses the noun in the singular.

So Hungarian says the equivalent of:

• many skill
• three book
• five student

not because the meaning is singular, but because that is the grammar pattern.

That is why you get:

• sok készsége van

not normally sok készségei van

If you are thinking in English, this feels unusual, but it is completely standard Hungarian.

For the same reason: the quantified noun phrase is treated as grammatically singular here.

Because Hungarian uses a singular noun after sok, the verb also appears in the singular:

• sok készsége van

This is the normal pattern with quantified expressions.

So even though the meaning is plural in English, the Hungarian grammar here is singular.

Because Hungarian adjectives usually do not agree with the noun the way adjectives do in many Indo-European languages.

In tapasztalt csapatnak:

• tapasztalt = experienced
• csapatnak carries the case ending

The adjective stays unchanged; the noun shows the grammar.

So Hungarian says:

• tapasztalt csapatnak

not something like tapasztaltnak csapatnak

This is normal for attributive adjectives in Hungarian.

Yes. Hungarian word order is flexible, and changing it often changes focus or emphasis, not the basic meaning.

This sentence is a natural neutral version:

• A tapasztalt csapatnak sok készsége van.

It presents the experienced team as the topic, then says something about it.

You could also say:

• Sok készsége van a tapasztalt csapatnak.

This puts more emphasis on having many skills.

So the word order can move around, but the version you were given is a very normal one.

No, but it is a very common and natural way.

Hungarian also has other ways to express similar ideas, for example with verbs meaning possess or be equipped with, but the structure with -nak/-nek + possessed noun + van is one of the most basic and useful patterns to learn.

So even if there are alternatives, this sentence is an excellent model for how Hungarian commonly expresses possession.