How can I learn basic Korean for preparing a trip to Korea?

Hello! I am planning a trip to Korea soon and I would like to learn at least the basics of Korean. I have about 4-5 months until the trip, and I am wondering how I can learn Korean that I can use in daily life. I can study for about 30-60 minutes a day, but it is difficult for me to use paid services. I have been looking for various methods on the internet, but I think advice from those who have actually learned Korean or had similar experiences would be more helpful, so I am posting this. Do you have any tips or free learning materials that would be helpful for learning practical Korean that can be used in areas like Gangnam, Hongdae, or Itaewon? I would appreciate your experiences and advice. Thank you!