1️⃣ If you struggle to understand determinants, stop what you are doing and check out this video by @3blue1brown, it will make your brain explode.
2⃣ Sometimes, it is hard to figure out what a concept represents by looking at how it is calculated. The determinant of a matrix is calculated by a sum, iterating through all permutations of a row. 
3⃣ However, this definition doesn't reveal anything about what the determinant means. In fact, it is quite simple: it describes how the volume scales under the corresponding linear transformation.
4⃣ What was the concept which you struggled to understand until you were able to look at it from a different perspective and it suddenly became clear?
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