When I was serious about learning Korean (about 5 years ago), the best way I learned was by listening to a lesson a day with their app on my phone, on my commutes created by Talk to Me in Korean. The lessons were short and I could practice what I learned or memorized the lesson throughout the day. It has since grown into youtube videos, interactive discussions, and extended course material. It’s definitely a great place to start because it’s also FREE. Definitely check it out!