Is it difficult to understand Korean colloquial expressions?

Have you ever struggled to understand colloquial expressions while learning Korean? Expressions like '신났꾸욤', '몰라', and '우리네' can have meanings and grammatical structures that are somewhat unique. Korean is used somewhat differently in written and spoken forms. In colloquial language, expressions that are often grammatically incomplete or carry specific nuances appear frequently. For example, '신났꾸욤' is a form of '신났다' with '꾸욤' added to give it a cute feeling, and it is commonly used in informal situations. The '라' in '몰라' can be interpreted in various ways depending on the emotion or situation, while the '네' in '우리네' indicates an emotional bond among people from our country. Do you have any tips or experiences that could help in understanding and using these Korean colloquial expressions? Please share your thoughts and experiences!