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Topics covered in the first two or three semesters of college calculus. Everything from limits to derivatives to integrals to vector calculus. Should understand the topics in the pre-calculus playlist first (the limit videos are in both playlists)
Double and triple integrals
Volume under a surface with double integrals. Triple integrals as well.
A single definite integral can be used to find the area under a curve. with double integrals, we can start thinking about the volume under a surface!
This is about as many integrals we can use before our brains explode. Now we can sum variable quantities in three-dimensions (what is the mass of a 3-D wacky object that has variable mass)!