Je kunt eraan beginnen zodra je alle aantekeningen hebt verzameld.

Both je kunt and jij kan exist in Dutch, but je kunt is usually the more standard and neutral form.

• kunnen = to be able to / can
• with je/jij, the common forms are kunt and kan
• je kunt sounds especially natural in standard written Dutch

So in this sentence, Je kunt eraan beginnen is the safest, most standard wording.

Er + aan = eraan.

This is a pronominal adverb, which Dutch uses very often. It replaces aan + het/dit/dat/iets, depending on the context.

Here, beginnen aan iets means to start on something.
So:

• aan de taak beginnen = start the task
• eraan beginnen = start on it

In this sentence, eraan refers to whatever task or project the notes are for.

Because beginnen can be used in different ways in Dutch.

Common patterns are:

• beginnen = to begin
• beginnen met iets = to start with something
• beginnen aan iets = to start on something, especially a task or larger piece of work

In this sentence, eraan beginnen suggests starting work on something after the preparation is finished. It is not just begin in a general sense, but begin working on it.

Yes, often you can, but the nuance is slightly different.

• eraan beginnen = start on it
• ermee beginnen = start with it

In many everyday situations, both are possible and close in meaning.
However, beginnen aan is very common when talking about tackling a task, assignment, project, or piece of work.

So Je kunt eraan beginnen sounds very natural here.

Because Dutch often places infinitives at the end when they depend on a modal verb.

Here:

• kunt = modal verb (can)
• beginnen = main infinitive

So the pattern is:

• Je kunt ... beginnen
• literally: You can ... begin

This is normal Dutch word order.

Zodra means as soon as.

It is more specific than als or wanneer:

• zodra = as soon as
• wanneer = when
• als = when / if, depending on context

So zodra emphasizes that one action can happen immediately after another is completed.

In this sentence:

• zodra je alle aantekeningen hebt verzameld
  = as soon as you have collected all the notes

Because zodra introduces a subordinate clause, and subordinate clauses usually send the verbs to the end in Dutch.

Main clause:

• Je kunt eraan beginnen

Subordinate clause:

• zodra je alle aantekeningen hebt verzameld

In that subordinate clause, both parts of the verb come at the end:

• hebt = auxiliary verb
• verzameld = past participle

That is standard Dutch subordinate-clause word order.

Because the sentence is talking about something that must be completed before the next action happens.

• hebt verzameld = have collected
• verzamelt = collect / are collecting

Using hebt verzameld makes it clear that all the notes need to be gathered first, and only then can you start.

So Dutch uses the present perfect here for the completed earlier action:

• first: je hebt alle aantekeningen verzameld
• then: je kunt eraan beginnen

Aantekeningen means notes.

Singular:

• de aantekening = the note

Plural:

• de aantekeningen = the notes

Depending on context, it can mean:

• notes you wrote down
• study notes
• written observations
• annotations

In this sentence, it most naturally means a set of notes that need to be gathered before starting the next task.

Alle aantekeningen is the normal modern way to say all the notes.

• alle is the usual determiner before a plural noun
• al de exists, but it is less common and can sound more formal, literary, or regional

So:

• alle aantekeningen = standard, natural
• al de aantekeningen = possible, but less usual

Yes. In Dutch, je can refer to:

• you singular
• you plural, in some informal contexts
• a general you meaning one / people

Without extra context, je here is usually understood as singular or general informal you.

If the speaker wanted a clearly formal singular or plural you, they might use u instead:

• U kunt eraan beginnen zodra u alle aantekeningen hebt verzameld.

Yes, it is very natural.

It sounds like normal Dutch for saying that someone can start a task once the preparation is complete. The structure is clear and idiomatic:

• Je kunt eraan beginnen = You can start on it
• zodra je alle aantekeningen hebt verzameld = as soon as you have collected all the notes

A native speaker would understand it immediately.