Start with a problem. I'm building https://helppet.ai, a voice agent for Veterinarians. I didn't know anything about AI programming other than absolute fundamentals I learned in 2017 through Stanford AI course - this was just theory and a lot has changed. I followed startups doing solving similar problems, and I asked detailed questions to everyone I could. I went to AI hack events to learn techniques others are using. Eventually I ended up with something pretty great and had fun doing so. So start with a problem and then work backwards.