Welcome to Gaia! ::

I learned these myself.

annyeong 안녕! : Hi / Bye! (informal)
ne / ye 네 : yes
aniyo / ani 아니요 / 아니 : no
babo / bapo 바보 : fool
kamsahamnida 감사함니다 : Thank you (formal)
gomawo 고마워 : Thanks (to friends or people younger)
araso 아라소 : Understand

Some of the words can be used as a question or an answer, depending on your tone

Most were learned by myself

annyeong : Hi / Bye! (informal)
ne: yes
aniyo : no
babo: fool
kamsahamnida : Thank you (formal)
anyeonghaseyo: Hello (formal)
Yawbuhseyo: Answer phone
Neorago: Its you (go suju!)

This i learned from a friend
Anyeonghaseyo....Jahl jin eh se yo: Hello. How are you?

Eh, I know too much to post here, but i'll try. (even though its like a lateeee post)

Annyeong 안녕 - hello/bye
Annyeong haseyo 안녕하세요 - hello formal
saranghae 사랑해 - i love you informal
wae 워 - why
mweoh 뭐 - what
malhae 말해 - tell me
molla 몰라 - i don't know
gwenchana 권찬아 - its okay
ne/ye/de 네/에/데 - yes
aniyo/anie 아니요/아니 - no
kamsahamnida 감사합니다 - thank you formal
komawo 고마워 - thank you informal
mianheyo 미안헤요 - i'm sorry informal
yeoboseyo 여보세요 - hello phone
babo 바보 - fool/idot
saengil chukahamnida 생일추가합니다 - happy birthday formal
jeongmal 정말 - really
unni 언니 - older sister said by younger sister
oppa 오빠 - older brother said by younger sister
nuna 누나 - older sister said by younger brother
hyung 형 - older brother said by younger brother
dongsaeng 동생 - younger sibling
umma 엄마 - mom
appa 아빠 - dad
bi 비 - rain
dashi 다시 - again
bonamana 보나만아 - obviously
sarang 사랑 - love
manhi 많이 - a lot
nomu 노무 - so/too
miinah 미인아 - beauty
yeppo 여뽀 - pretty
nappeun 나쁜 - bad
namja 남자 - boy
yeoja 여자 - girl
neo/neon 너/넌 - you
ttaemunae 때문에 - because of you
hajiman 하지만 - but
keuraeseo 그래서 - so
keureonde 그런데 - well
shipeo 싶어 - want
ama 아마 - maybe
jebal 저발 - please
cheonmaneyo 천만에요 - your welcome
cheoreom 처럼 - like
ottohke 어떻게 - how
joha 좋아 - good
kaja 가자 - let's go
ara 아라 - know
keurigo 그리고 - and
irohke 이렇게 - like this


i probably know more than that lol..