Along with 母 [모] is the Hanja that represents one of the most important people in your life: mother. So it is no surprise it appears in many words.
To point out a certain behaviour is not allowed, you can use the Korean grammar pattern -(으)면 안 되다. Luckily, it is a rather easy to understand pattern.
To ask for or to give permission, you can use the Korean pattern -아/어도 되다. It is a simple way to do all the things you do with the English word “may”.
Sino-Korean number 만 (10 000) has the Hanja 萬 [만] associated with it. It is a complex-looking character for a frequently used number.
Expressing that something is required or necessary can be done easily by using either -아/어야 해요 or -아/어야 되요. Though complicated-looking, it is easy to use.
If there is one thing I miss from the streets of Seoul, it is not the hustle and bustle, but Odeng (오댕) or oemukguk (어묵국) as it is known in proper Korean.
-지 마세요 is the negative of -(으)세요. It is the Korean imperative to demand or request someone to not do something. It is important to know as it is common.
The most common imperative in Korean is the form -(으)세요. You use it to place orders, to make requests, give directions, etc. So it is important to know.
To express you know how to do something in Korean, you can use the Korean grammar pattern -(으)ㄹ 줄 알다. To express the opposite, you use -(으)ㄹ 줄 모르다.
-(으)ㄹ 수 있다 is a Korean grammar topic you use to express you can do something or something is possible. -(으)ㄹ 수 없다 is its negative. Both are easy to use.