Learn Hardcore Icelandic: Geturðu skrifað þetta rétt?

So the full form is Getur þú ...?, but Icelandic very often joins them together as Geturðu ...?. That joined form is completely normal and standard.

Why does the sentence start with the verb?

Because this is a yes/no question.

In Icelandic, yes/no questions often put the finite verb first:

Þú getur skrifað þetta rétt. = statement
Geturðu skrifað þetta rétt? = question

So the word order changes the same way English changes You can... to Can you...?

Why is it skrifað and not skrifa?

After geta, Icelandic normally uses the verb form called sagnbót or supine.

So:

að skrifa = to write
skrifað = the form used after geta in this kind of sentence

That means Geturðu skrifað ...? is the expected pattern.

This can feel strange to English speakers, because English uses the bare infinitive after can: can write. Icelandic uses a different form here.

What does þetta mean grammatically, and why is that form used?