I've put lesson 2 behind a cheeky paywall because I want to gauge support and I want to find out how many of you actually have bank accounts and are not 10 year old children pretending to be adults.
If you're interested, lesson 2 is in the same format as lesson 1, and it goes into using matrices to solve systems of equations, inverse matrices and common mistakes people make. Put your payment details in and you can access it for $1: