I feel like it's obligatory to also drop a link to the 3blue1brown series on linear algebra, for anyone interested in learning - it is a step up from what's in this post, but these videos are brilliant and still super accessible:
One of my favourite internet things is seeing other channels, for instance Reducible (https://www.youtube.com/@Reducible) use the framework. Everyone has their own special take on it, and it's so awesome that Grant made it OS!
https://youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2xVFit...