What is the best way to learn Korean correctly?

Personally Talk To Me In Korean is the best source I have seen. They are very concise and to the point, and the lessons are very structured with great text books that you can easily buy. They’ve been one of the longest running Youtube channels out there that teaches Korean. I highly recommend checking out their videos and buying their books *(not sponsored, just saw their textbooks and they were really great)
https://www.youtube.com/c/TalkToMeInKorean2009