别的... is an adjective. It means other.... This word is always followed by some nouns. For example, 别的事情（other things），别的人（other people） 主要 means mostly/main. it is a little bit similar with important. For example, 主要内容（main point），主要目标（main objective/goal） 我们现在的主要目标就是打败对手，别的任何事情都不重要。 Now our main goal is to beat the opponent, everything else is/other things are not important. Cici, I hope this will help you. Actually, you can explain your questions in more details. I think it is easier to understand new words by using them in sentences, instead of just studying the words.

thanks a lot！

哦 謝謝你的回答！

i guess you may be a little confused of these words just because of their similar shape and or pronunciation. Actually they have different in meanings. 清：adi. unmixed; clear. e.g.: 清水（clear water），天气晴朗（The sky is clear and bright.） 情：n. feeling; affection. e.g.: 爱情（love），亲情（affection between family members），友情（friendship） 青：adj. a kind of color, green or blue. e.g.: 青椒（green pepper），青山（green hills） hope it helps