I recently started Rocket Korean (RK), in preparation of an upcoming business trip to Seoul that will also see me explore the country by train. I am still at the very beginning – about a week in – but so far so fun: the RK teaches are engaging and keep the students motivated. The tough part of learning any language is to keep practicing the new words and phrases, and each chapter in RK has several different drills to practice and reinforce the contents of the lesson. Make sure to explore the settings and adjust them to your liking: initially I was not very fond of the Scorecards, but now that I found that I could switch on both audio on reveal and the romanization of the phrase on “back” of the card, I love them. One of the strong points of RK is the voice recognition feature – use it! You may not want to replay yourself all the time (though you can), but the AI identifies what you say and gives you a 0-100% score, and I use this tool a lot. The AI isn't perfect, of course, so be prepared to have animated arguments with your microphone, even if it is a professional-grade one.