Voor mijn scriptie gebruik ik een betrouwbare bron en noteer ik elk citaat zorgvuldig.

Voor mijn scriptie is a prepositional phrase meaning something like for my thesis or in connection with my thesis. Dutch often puts this kind of context phrase first.

When you put something other than the subject first in a Dutch main clause, the finite verb must still stay in second position. That is why you get gebruik ik instead of ik gebruik.

Compare:

• Ik gebruik een betrouwbare bron.
• Voor mijn scriptie gebruik ik een betrouwbare bron.

Scriptie is a Dutch academic word for a substantial student paper, usually a thesis, dissertation, or final research paper, depending on the level of study and the school system.

It does not mean an English script for a film or play.

They are:

• de bron
• het citaat

This matters because Dutch grammar often depends on whether a noun is a de-word or a het-word. In this sentence, that affects things like:

• adjective endings: een betrouwbare bron
• determiners: elk citaat rather than elke citaat

So learning the article together with the noun is very useful.

Because betrouwbare is an adjective placed before the noun, and in Dutch these adjectives usually take -e.

Here, bron is a de-word, so you need:

• een betrouwbare bron

But when the adjective comes after the verb, it usually has no -e:

• De bron is betrouwbaar.

So:

• before the noun: betrouwbare
• after the verb: betrouwbaar

Because the opening phrase Voor mijn scriptie can be understood with both parts of the sentence:

• Voor mijn scriptie gebruik ik ...
• (Voor mijn scriptie) noteer ik ...

Dutch often keeps the same inversion pattern in the second coordinated clause, so you get:

• gebruik ik
• noteer ik

If the second clause stood alone, the normal order would be:

• Ik noteer elk citaat zorgvuldig.

Yes, that is possible:

• Voor mijn scriptie gebruik ik een betrouwbare bron en noteer elk citaat zorgvuldig.

Because the subject is the same in both parts, Dutch can omit it in the second clause.

Still, repeating ik is also completely normal:

• ... en noteer ik elk citaat zorgvuldig.

Repeating it can sound a bit clearer or more balanced.

Because citaat is a singular het-word: het citaat.

With singular nouns:

• elk is used with het-words
• elke is used with de-words

So:

• elk citaat
• elke bron

This is a very common pattern in Dutch.

Yes. Ieder citaat is also correct.

Both elk and ieder can mean every or each. In many situations they are interchangeable. Very roughly:

• elk is extremely common and neutral
• ieder can sound a little more formal or slightly more focused on items one by one

So elk citaat is a natural choice, but ieder citaat would also work.

Here, zorgvuldig is an adverb. It describes how the action is done: how I note down the quotation.

Adverbs in Dutch do not take the -e ending:

• Ik noteer elk citaat zorgvuldig.

But before a noun, the adjective usually does take -e:

• een zorgvuldige student
• een zorgvuldige notitie

So:

• modifying a verb: zorgvuldig
• modifying a noun: zorgvuldige

Yes. Dutch often uses the present tense for a general habit, routine, or ongoing academic practice.

So gebruik ik and noteer ik do not have to mean only right now at this exact moment. They can also mean something like:

• this is what I do when working on my thesis
• this is my normal method

That is very natural in Dutch.