What do YOU recommend if I want to start learning open source A.I.?

Kbin seems to have many open source and programming experts. And probably many experts in A.I. . I am curious about learning to use and develop (train?) an open source A.I. as a learning exercise.

I am pretty technically savvy, but depending on your definition, probably not a programmer. I've built my own PCs several times, I worked in SQL and studied a couple object oriented programming languages in school for a short time. Also limited Visual Basic experience years ago.

I know I could just play around with ChatGPT or whatever other tools exist but I want to delve more deeply.