I september og oktober køber jeg ofte nye bøger, fordi jeg gerne vil starte på noget nyt.

This is because Danish follows the V2 rule in main clauses: the finite verb usually comes in second position.

Here, I september og oktober is the first element, so the finite verb køber must come next:

I september og oktober køber jeg ofte nye bøger.

So the order is:

• I september og oktober = first element
• køber = finite verb in second position
• jeg = subject

If the sentence started with the subject instead, you would get:

Jeg køber ofte nye bøger i september og oktober.

Both are correct, but the first version emphasizes the time expression a bit more.

Here i means in or during.

So:

• i september = in September
• i oktober = in October

With months in Danish, you normally use i without any article:

• i januar
• i maj
• i december

You do not say the equivalent of in the September.

Because one i can apply to both months together.

So:

• i september og oktober = in September and October

This is completely normal. You could repeat i for extra clarity in some contexts, but it is usually unnecessary here.

In Danish, months are normally written with lowercase letters, unlike in English.

So Danish writes:

• september
• oktober
• mandag
• jul

not:

• September
• Oktober

They are only capitalized if they begin a sentence.

In Danish, adverbs like ofte often come after the finite verb and before the object in a main clause.

So:

• jeg køber ofte nye bøger

This is a very typical pattern:

• Jeg læser ofte avisen.
• Hun spiser sjældent kød.
• Vi køber tit kaffe.

So ofte is not modifying bøger directly; it describes how often the action happens.

Yes. Køber is the present tense of at købe.

• at købe = to buy
• køber = buy / am buying / do buy, depending on context

In this sentence, it expresses a habitual action, so in natural English it would often be translated with the present simple:

I often buy new books...

Danish uses the present tense very naturally for repeated habits like this.

Because bøger is plural, and the adjective must match that.

The adjective ny changes form:

• ny bog = a new book
• nyt hus = a new house
• nye bøger = new books

So:

• ny = common gender singular
• nyt = neuter singular
• nye = plural or definite form

Since bøger is plural, you need nye.

Because noget is grammatically treated as neuter, so the adjective takes the neuter form.

That is why you get:

• noget nyt = something new

Compare:

• en ny idé = a new idea
• et nyt projekt = a new project
• noget nyt = something new

This is a very common pattern in Danish:

• noget godt = something good
• noget spændende = something exciting
• noget mærkeligt = something strange

Gerne is a very common Danish word that often adds the sense of gladly, with pleasure, or would like to.

So:

• jeg vil starte = I want to start / I will start
• jeg vil gerne starte = I would like to start

In many contexts, gerne makes the sentence sound more natural and less blunt.

You will often see it with verbs of wanting or liking:

• Jeg vil gerne lære dansk. = I would like to learn Danish.
• Hun kommer gerne. = She’ll gladly come.
• Vi vil gerne hjælpe. = We would like to help.

Because after a modal verb like vil, Danish normally uses the bare infinitive, without at.

So:

• jeg vil starte
• du kan læse
• han skal arbejde
• vi må gå

not:

• jeg vil at starte

Common modal verbs in Danish include:

• vil = want to / will
• kan = can
• skal = must / shall / have to
• må = may / be allowed to / must
• bør = ought to

Starte på means start on, begin, or get started with something.

So:

• starte på noget nyt = start something new / begin something new / get started on something new

The preposition på is very natural here when talking about beginning a project, task, interest, or similar activity.

You may also hear:

• begynde på noget nyt

which is very similar in meaning.

Because fordi introduces a subordinate clause, and subordinate clauses usually have different word order from main clauses.

In a subordinate clause, the subject normally comes before the finite verb:

• fordi jeg gerne vil starte på noget nyt

not:

• fordi vil jeg gerne ...

So compare:

Main clause

• Jeg køber ofte nye bøger.

Subordinate clause

• ... fordi jeg ofte køber nye bøger.

This difference is very important in Danish grammar.

Yes, in normal use fordi means because.

It introduces the reason for something:

• Jeg bliver hjemme, fordi jeg er træt.
• Hun lærer dansk, fordi hun bor i København.

In your sentence, the reason is:

... fordi jeg gerne vil starte på noget nyt.

So the speaker buys new books because they want to begin something new.

Yes, absolutely. Noget nyt is often quite broad and abstract.

It can mean:

• a new book
• a new project
• a new hobby
• a new experience
• something fresh or different in life

So in this sentence, starte på noget nyt does not necessarily mean starting one specific physical object. It can mean beginning some new activity, interest, or phase.

The letter ø represents a vowel that does not exist exactly in standard English, so English speakers often need practice with it.

Very roughly:

• køber
• bøger

contain a rounded front vowel, somewhat like the vowel in French deux or German schön, if you know those.

A few helpful points:

• your tongue is fairly forward in the mouth
• your lips are rounded
• it is not the same as English o or u

Also note that:

• køber = buyer / buys
• bøger = books

so getting ø right helps with understanding and being understood.

Yes. That is also correct.

The difference is mainly focus:

• I september og oktober køber jeg ofte nye bøger ...
  puts the time frame first and gives it more emphasis

• Jeg køber ofte nye bøger i september og oktober ...
  starts more neutrally with the subject

Both are natural Danish.

The dictionary forms are:

• at købe = to buy
• at ville = to want / will
• at starte = to start

Forms used in the sentence:

• køber = present tense of at købe
• vil = present tense of at ville
• starte = infinitive, used after the modal verb vil

This is a very common structure in Danish: present-tense modal + infinitive

For example:

• Jeg vil lære.
• Hun kan komme.
• Vi skal arbejde.