You already know that 'I' in Korean is 저/나. You also know the translation for various objects in Korean.
의 is a particle that indicates that one is the owner/possessor of another object. It has the same role as putting an apostrophe followed by "s" in English. For example:
저 - I
책 - book
저의 책 - my book그 사람의 차 - That person's car
의사의 탁자 - The doctor's table
선생님의 차 - teacher's carYou can use these words in sentences you are familiar with (with verbs and adjectives):
선생님의 차는 크다 - The teacher's car is big
나는 선생님의 차를 원하다 - I want the teacher's car
나의 손가락은 길다 - My finger is longYou will find that words like "my/our/their/his/her" are often omitted from sentences. As you will learn continuously throughout your Korean studies, Korean people love shortening their sentences wherever possible. Whenever something can be assumed by context, words are often omitted from sentences to make them more simple. For example:
나는 나의 친구를 만나다 - I meet my friend
Can be written as the following:
나는 친구를 만나다 - I meet (my/a) friendIn this case (and many others like it) you are clearly meeting "your" friend, so the word "my" can be omitted from the sentence.

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LEARN KOREAN (한국어) [GRAMMAR] #1
RandomThis is book #1 for the Korean Language series. Try to understand all of the notes in this book before you proceed to the next one. Good luck ! This book contains Korean grammar. Try to understand it so that you can understand how to make a sentence...