Both Karpathy and fast.ai are good resources. Karpathy is "bottom up" (start from first principles and build on it) while fast.ai is "top down" (you start w/ working examples and gradually "peel off" to understand it).

Both approaches have merit, and it may come down to personal preferences.

  - karpathy: https://karpathy.ai/zero-to-hero.html
  - fast.ai: https://course.fast.ai/Lessons/lesson1.html