“Also” is very high frequency Koreans use, so you have to be familiar to know how to use this. Also is 또한/ddo han or 도/do in Korean. 또한 it has another similar meaning of “in addition.” It is using as an adverb in a sentence and you can use it at the beginning of sentence or middle of sentence. For instance, “I also like you/나 또한 너를 좋아해요” “In addition, that’s wonderful/그것 또한 대단하다.” 도 is also “also”. However, when you use 도, it should be after a noun. For instance, I like a computer and also like a printer/컴퓨터와 프린터도 좋다. As you see the 도 is right after the printer(noun), it never be in front of noun.

“Again” is also high frequency you need to learn when you study Korean language. Again is 다시/da si or 또/ddo in Korean

또 includes negative nuance. For instance, I am so sorry, I am late again/ 죄송합니다, 또 늦었습니다. If you are uncomfortable to use 또 which has negative connotation, you can use 다시. For instance, you can use 다시, “Shall we dance again?/ 우리 다시 춤 출까요?”