Die boetebedrag is verkeerd.

No. In this sentence, die means the.

So Die boetebedrag = The fine amount / The amount of the fine.

It is also pronounced very differently from the English verb die. In Afrikaans, die sounds more like dee.

Yes. Afrikaans very often joins nouns together to make a single compound word.

Here:

• boete = fine, penalty
• bedrag = amount, sum

So:

• boetebedrag = fine amount / amount of the fine

This is very normal in Afrikaans. English sometimes uses separate words where Afrikaans prefers one compound word.

Because compound nouns in Afrikaans are usually written as one word.

So:

• boetebedrag = correct
• boete bedrag = not standard

This is an important habit to learn in Afrikaans: if two nouns belong tightly together as one idea, Afrikaans often writes them together.

Because Afrikaans verbs do not change much for different subjects.

The verb is is the present tense of wees (to be), and it stays is with all persons:

• ek is = I am
• jy is = you are
• hy is = he is
• ons is = we are
• hulle is = they are

So Die boetebedrag is verkeerd is structurally very straightforward.

Because verkeerd comes after the verb is, so it is being used predicatively.

In Afrikaans, adjectives after a linking verb like is usually stay in the basic form:

• Die boetebedrag is verkeerd. = The fine amount is wrong.

But before a noun, the adjective often takes -e:

• die verkeerde boetebedrag = the wrong fine amount

So:

• after is → verkeerd
• before a noun → often verkeerde

Not especially. This is a normal Afrikaans main clause:

• Die boetebedrag = subject
• is = verb
• verkeerd = complement

So the sentence order is:

subject + verb + complement

In this example, Afrikaans looks a lot like English.
A useful thing to remember, though, is that Afrikaans main clauses usually put the finite verb in the second position.

It most often means wrong, incorrect, or mistaken.

In this sentence, the natural meaning is incorrect:

• the amount has been entered wrongly
• the figure is not right

Depending on context, verkeerd can sometimes also mean the wrong one or just mistaken, but here incorrect is the clearest sense.

Not in the way languages like German do, and not in the same way as Dutch either.

For learners, the important point is:

• die is the normal definite article you will see with most nouns
• you do not have to learn lots of adjective or article changes based on gender the way you would in some other languages

So die here is just the normal word for the.

Yes. A more expanded version would be:

Die bedrag van die boete is verkeerd.

That literally means something like: The amount of the fine is wrong.

Both versions are understandable, but boetebedrag is a neat, typical Afrikaans compound.

Grammatically, yes, but it would usually sound less natural without context.

• Die boetebedrag is verkeerd = The fine amount is wrong
  → a specific amount is being discussed

• ’n boetebedrag is verkeerd = A fine amount is wrong
  → more general or less specific, which is less likely in real use unless the context makes it clear

So the sentence with die is the more natural one in most situations.