Almost all books and websites of teaching how to speak Korean use polite word (존댓말 Jon-det-mal).
It is important to learn polite style because we must appropriately use it (I'm using 'must' than 'should' because if you don't use polite style, especially to people who are older than you, your boss, or unknown people, they would think that you are rude. People think it is understandable when foreigners use not-polite style (반말 Ban-mal). However, they may expect you to use polite style if you stay long in Korea.
HOWEVER, I'm gonna give you just simple, easy, but useful tip of using polite style.
Which means, I will teach you plain and not-polite style. (reason? I feel that you guys can find a lot of sources of learning Korean-polite style-but not the other one. So, I want to teach Korean that you can use it to your friends (same or younger people). I will give you slang, teenage words, and chat words.
Lets's start greeting !!!
Many people know 안녕하세요 (an-young-ha-sea-yo : Hi or Hello)
This is polite style. You can use this when you meet people.
But, I told you I want to teach you guys plain and not-polite style.
안녕 (an-young: HI) plain style
안냥 (an-yang: Hi) usually, girls who want to make cute sound.
방가워 (bang-ga-wo: nice to see you) (The right spelling is 반가워 -Ban-ga-wo- but
방가
(bang-ga : nice to see you) (it's is more chat word)
방가방가
(bang-ga bang-ga: nice to see you) (chat word,
make sounds cute)
하이룽
(hi-roong : hi) (chat word)
방가방가 ~~~
