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.
TV, YouTube, podcasts, music, watching my partner game. I originally picked knitting up as something to do other than scroll on my phone while doing those things.