Possessive pronouns are:
мій (my,mine)
1) Masculine nouns:
мій брат - my brother
мій друг - my friend

2) Femine nouns:
моя сестра - my sister
моя мама - my mother

3) Neuter nouns:
моє ім'я - my name
моє село - my village

4) Plural nouns:
мої - ( брати, сестри, книжки)
my - (brothers, sisters, books)

Possesive pronounce are:

мій (my,mine)

1) Masculine nouns:

мій брат - my brother

мій друг - my friend

2) Femine nouns:

моя сестра - my sister

моя мама - my mother

3) Neuter nouns:

  моє ім'я - my name

  моє село - my village

4) Plural nouns:

мої - ( брати, сестри,  книжки)

my - (brothers, sisters, books) 

Hello! These pronouns are used to say that something belongs to you.

For example, imagine that you are holding a book. You want to say that the book belongs to you, "It's my book". You should think of the gender of the word "book" - книга. It ends in "а", so it's feminine. It means that you need the feminine version of "my" - "моя". We land with "Це моя книга (fem.)".

Now imagine that you are with your friend. You want to say, "It's my friend". "Friend" (друг) ends in a consonant, so it's masculine and you need a masculine version of "my" which is "мій". In the end you have: Це мій друг (masc.).

Imagine that you are holding an apple and don't want to share it ;) You say, "It's my apple". The word "apple" (яблуко) ends in "o", so it's neuter and you need the neuter version of "my" - "моє". You say: Це моє яблуко (neut.).

The good news is that when you have some objects, when you have something in plural, you don't need to think about the gender of these words. You always use "мої" for the plural form of the words of any gender. Це мої книги (fem.Pl.). Це мої друзі (masc.Pl.). Це мої яблука (neut.Pl.).

Do you know other possessive pronouns? They are:

your (sing. and informal) - твій (masc.), твоя (fem.), твоє (neut.), твої (Pl.)
her - її (masc., fem., neut., Pl.)
his - його (masc., fem., neut., Pl.)
our- наш (masc.), наша (fem.), наше (neut.), наші (Pl.)
your (pl. or formal) ваш (masc.), ваша (fem.), ваше (neut.), ваші (Pl.)
their - їх (masc., fem., neut., Pl.)

твій друг (your friend), твоя книга (your book), твоє яблуко (your apple), твої друзі (your friends)
її друг (her friend), її книга (her book), її яблуко (her apple), її друзі (her friends)
його друг (his friend), його книга (his book), його яблуко (his apple), його друзі (his friends)
наш друг (our friend), наша книга (our book), наше яблуко (our apple), наші друзі (our friends)
ваш друг (your friend), ваша книга (your book), ваше яблуко (your apple), ваші друзі (your friends)
їх друг (their friend), їх книга (their book), їх яблуко (their apple), їх друзі (their friends)

Good luck with Ukrainian! =)

I haven't figuted out how to edit my post. I mispelled the word 'understand' in case anyone was confused, sorry about that.