I agree, it seems like no help just to list a formula to memorize. If someone knows enough linear algebra to understand what the formula represents, they can do

I agree, it seems like no help just to list a formula to memorize. If someone knows enough linear algebra to understand what the formula represents, they can do the derivation. This link [1] is a good one if anyone is interested. [1] https://eli.thegreenplace.net/2014/derivation-of-the-normal-equation-for-linear-regression https://eli.thegreenplace.net/2014/derivation-of-the-normal-...