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 - Difficulty: 🌟🌟
 - Class Hour: Varying from person to person
 
-The calculus course at MIT consists of *MIT18.01: Single variable calculus* and *MIT18.02: Multi variable calculus*. If you are confident in your math, you can just read the course notes, which are written in a very simple and vivid way, so that you will not be tired of doing homework but can really see the essence of calculus.
+The calculus course at MIT consists of *MIT18.01: Single variable calculus* and *MIT18.02: Multivariable calculus*. If you are confident in your math, you can just read the course notes, which are written in a very simple and vivid way, so that you will not be tired of doing homework but can really see the essence of calculus.
 
 In addition to the course materials, the famous Youtuber **3Blue1Brown**'s video series [The Essence of Calculus](https://www.youtube.com/playlist?list=PLZHQObOWTQDMsr9K-rj53DwVRMYO3t5Yr) are also great learning resources.