Als je op de verkeerde link hebt geklikt, kun je het venster gewoon sluiten en opnieuw beginnen.

Als means if here. It introduces a condition:

• Als je op de verkeerde link hebt geklikt = If you clicked the wrong link

In Dutch, a clause starting with als is a subordinate clause, so it affects the word order later in the clause.

Hebt geklikt is the perfect tense, which is very common in everyday Dutch when talking about something that has already happened.

• je hebt geklikt = you have clicked / you clicked

Dutch often prefers the perfect tense in speech where English might simply use the past tense.

Here:

• hebt = auxiliary verb from hebben
• geklikt = past participle of klikken

Because Als je op de verkeerde link hebt geklikt is a subordinate clause.

In Dutch subordinate clauses, the conjugated verb and other verb parts usually move toward the end. So instead of a main-clause order, you get:

• je hebt op de verkeerde link geklikt in a normal main clause
• als je op de verkeerde link hebt geklikt in a subordinate clause

That final position of geklikt is very typical in Dutch.

Dutch uses the preposition op with klikken:

• op een link klikken = to click on a link

This works like English click on. In informal English, people often just say click a link, but Dutch normally keeps op.

Link is a de-word in Dutch, so you say:

• de link
• de verkeerde link

The adjective verkeerd gets an -e ending because it comes before a noun with de:

• de verkeerde link
• compare with een verkeerde link

So this is standard adjective agreement.

Both are possible in many situations:

• je kunt = you can
• kun je = can you / you can depending on word order

Here, the sentence begins with the als clause. After that introductory clause, Dutch uses inversion, so the verb comes before the subject:

• Als ..., kun je ...

That is why you get kun je and not je kunt here.

Dutch can include dan in this kind of sentence, but it is often omitted.

So both of these are possible:

• Als je op de verkeerde link hebt geklikt, kun je het venster gewoon sluiten...
• Als je op de verkeerde link hebt geklikt, dan kun je het venster gewoon sluiten...

Adding dan can make the conditional relationship slightly more explicit, but leaving it out is very natural.

Venster is a het-word:

• het venster = the window

So Dutch uses het, not de.

Also, venster is a slightly more formal or technical word than raam. In computer contexts, venster is the normal word for a screen window.

Here gewoon means something like:

• simply
• just
• no problem, nothing special

So:

• je kunt het venster gewoon sluiten = you can just close the window

It gives the sense that this is the easy, straightforward thing to do.

Because they depend on kun je.

After the modal verb kunnen, Dutch uses the bare infinitive:

• kun je sluiten
• kun je beginnen

There is no te after a modal verb like kunnen, moeten, mogen, willen, etc.

So:

• kun je het venster sluiten
• kun je opnieuw beginnen

And here the two infinitives are coordinated:

• sluiten en opnieuw beginnen

Opnieuw means again or anew.

• opnieuw beginnen = to start again
• literally: to begin anew

It is written as one word: opnieuw.

This is a very common expression in Dutch.

Yes, often you can.

• opnieuw beginnen = start again, restart
• weer beginnen = begin again

In many contexts they are very similar. Opnieuw can sound a little more like from the beginning / afresh, while weer is the more general word for again.

In this sentence, opnieuw beginnen fits very naturally because the idea is to start the process over.

Because the sentence starts with a subordinate clause:

• Als je op de verkeerde link hebt geklikt, ...

In Dutch, when a subordinate clause comes before the main clause, it is normally separated by a comma. That comma helps mark the transition to the main clause:

• ..., kun je het venster gewoon sluiten ...

Yes. In modern Dutch, link is commonly used for an internet link or hyperlink.

So:

• de link
• op een link klikken

This is a normal and everyday word in Dutch, especially in digital contexts.