What are some popular slang and text words in Korea? something like ㅋㅋand ㄱㅅㄱㅅ I watch a lot of Korean dramas, variety shows and Kpop videos. There are a lot of terms and phrases I don't understand and I can't find them in books because they are informal.

College Student Looking to make Friends with People

Hello!  안녕하세요! 

I am new italki so I need some friends to help me learn. I want to learn Korean. If there is anyone who would like to be my friend, please ask/follow. 

Thank you! 감사합니다.