https://www.tandem.net/blog/learn-basic-korean-phrases
https://www.youtube.com/watch?v=Cmvk3E3NThI
안녕 (Annyeong)
감사합니다 (Gam sa hab nida)
This is a formal yet all-around way to offer your gratitude. South Korea holds courtesy in high regard, so you’ll definitely want to learn this one to express gratitude and respect.
천만에요 (Cheonman-eyo)
It’s not often that Koreans respond to a “thank you” with “you’re welcome,” but if you want to show extra politeness, then you can throw in this phrase. Normally, a simple and humble 아닙니다 (ah-nib-nee-da) suffices, meaning “it’s nothing.”
안녕 (Ahn-nyung) / 안녕히 계세요 (Ahn-nyung-hee geh-seh-yo) / 안녕히 가세요 (Ahn-nyung-hee gah-seh-yo)
There are multiple ways to say "goodbye" in Korean. 안녕 is used for informal situations with friends and family, for example. Korean differentiates between saying goodbye before you are about to leave a situation and when the other person leaves. The former is 안녕히 계세요 (literally translating to “please stay well”) and the latter, 안녕히 가세요 (literally translating to "please leave well").
잘자요 (Jaljayo)
미안해요 (Mianhaeyo)
실례합니다 (Shil-leh-hap-nee-da) / 잠시만요 (Jam-shi-mahn-yo)
실례합니다 is a great phrase to use in those situations where you'd like to politely get someone's attention. 잠시만요 literally translates to “wait a moment,” however, it can be used when accidentally brushing past someone.