Politeness Levels are, in my opinion, the largest and most complicated part of learning Korean - more than any other type of grammar. However, like any other type of grammar, they can also be learned and mastered through regular practice and exposure to the language. I actually created a new free 24-episode course called "Master Politeness Levels" which will start being posted April 8th, but before that I wanted to do an overall summary of the politeness levels.
So if you've already learned the basics of how politeness levels work, then this video is for you. I'll summarize how each type of speech is used, and discuss how using each one feels.