I am still at a point where I have to focus on the knitting, so right now the most I can do while knitting is listening to music that I need to learn, or participating in a conversation that does not take 100% of my brainpower.
EDIT: Revelation. I can also play idle/incremental games while knitting.
Another one for listening: mostly TV and youtube that are not visually heavy. I’m getting into some podcasts, but I haven’t made the leap to audio books yet.