Ask HN: Resources to Learn AI Fundamentals?

I finished Replit's 100 Days of Code for python. I'm looking for resources that are 1) up to date (APIs, libraries) and 2) focus on building projects.

I don't have a specific domain, but I want to focus on the fundamentals so I can better decide where to pivot to next (I find DL, GenAI, AI agents, and Robotics the most interesting domains).