Questions & Answers about W moim notatniku zapisuję nowe słowa, których chcę używać w pracy.
Because w means in here, and when w expresses location, it requires the locative case.
So:
- notatnik = notebook
- w notatniku = in the notebook
The adjective/pronoun mój also has to match that case:
- mój notatnik = my notebook
- w moim notatniku = in my notebook
So both words change because of the preposition w.
Zapisuję is:
- 1st person singular
- present tense
- from the imperfective verb zapisywać
It means something like I write down, I note down, or I record in writing.
In this sentence, it suggests a habitual or repeated action:
- I write down new words in my notebook
That is why the imperfective verb is natural here: it describes something you do regularly, not just one completed action.