Undergrad lin algebra and calculus ... start there! Although there is no skimmable view of those worth a damn. You need 2-3 months @ 8 hours a day. Stats there

Undergrad lin algebra and calculus ... start there! Although there is no skimmable view of those worth a damn. You need 2-3 months @ 8 hours a day. Stats thereafter is pie, ML low hanging fruit will come easily. Good inference and learning from data on the other hand is experience: expect years, no shortcuts. In fact, suffer. It’ll make the journey as informative as possible.