Learn Hardcore Dutch: Anna schrijft haar telefoonnummer in mijn schrift, zodat ik haar later om raad kan vragen. - Anna writes her phone number in my notebook so that I can ask her for advice later.

In Dutch you write in a notebook (“in mijn schrift”) because you’re putting words on its pages, not on top of the cover. Using op would imply you’re writing on the very outside of the notebook.

What’s the difference between schrift and notitieboek?

Schrift is typically a school exercise book with lined pages (think of a copybook pupils use). Notitieboek is a more general notebook or journal you might use for meeting notes, sketches, etc.

Why is zodat used here, and could we use om … te instead?

Zodat introduces a subordinate clause with its own subject and conjugated verb (here ik … kan vragen). You need zodat whenever you want “so that” plus a full clause. By contrast om … te requires an infinitive and no separate subject:
• Ik bel haar om raad te vragen. (I call her to ask for advice.)
But you cannot mix om … te with a modal in a separate clause, so you choose zodat ik haar later om raad kan vragen.

Why is the word order om raad kan vragen instead of kan om raad vragen or vragen om raad?

In a subordinate clause Dutch puts all verbs at the end, and within that cluster the finite verb (here kan) comes before the infinitive (vragen). The fixed expression om raad (literally “for advice”) must stay together as the verb’s complement, so you get om raad kan vragen. You could also say zodat ik haar later kan vragen om raad, but that shifts om raad after vragen and feels less direct than ik haar om raad kan vragen.

Why does the verb cluster kan vragen appear at the end of the subordinate clause?

Dutch subordinate clauses (those introduced by zodat, omdat, dat, etc.) follow the “verb-final” rule: all verbal parts go to the clause’s end. If there are two verbs, the finite (conjugated) one comes first, then the infinitive: …, zodat ik haar later om raad kan vragen.

What’s the difference between schrijven and the separable verb opschrijven?

Schrijven simply means “to write.” Opschrijven adds the nuance “to write down” or “to record” something you want to remember. If you used opschrijven here, you’d say:
Anna schrijft haar telefoonnummer op in mijn schrift.
(strictly you’d split the separable verb: prefix op goes to the end after the object.)

Why are there two haar pronouns, and what do they each refer to?

The first haar is a possessive pronoun modifying telefoonnummer (“her phone number”). The second haar is an object pronoun meaning “to her,” referring back to Anna as the person you’ll later ask for advice.