Making Korean friends is a huge advantage to learning the language. Learn some Korean friend culture and impress your friends with your know-how! These will help you relate and connect more with new Korean friends
One thing about Korean many people struggle with is the dynamics between people and speech. For native English speakers; especially if English if your only language, formalities is something that doesn’t exist to a quarter of the extent as in Korean. Korean is a culture based highly around respect and knowing or understanding you position and others.
A lot of Korean texting slang has a rooted meaning in the original word, just shortened to make it easier to type. Some originate from Korean itself like 엉 which is the most casual way to say yes or yeah in Korean, being reduced down to just ㅇㅇ. Or ᄋᄃ from 어디 (where), ᄆᄎ from 미쳤어 (crazy), etc.