I highly recommend these youtube videos by 3Blue1Brown https://www.youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2xVFitgF8hE_ab https://www.youtube.com/playlist

I highly recommend these youtube videos by 3Blue1Brown https://www.youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2xVFitgF8hE_ab https://www.youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2x.... Each short lecture had a 'Why didn't they tell me that in college!' kind of insight. Transformations, determinants, dot products, cross products everything made sense in a visual way.