Front, under the kneecap, and occasionally on the side.
I suspect the occasional side knee pain is ITB as I have suffered from that in the past so have been stretching and foam rolling as much as I can.
The under kneecap pain is what's getting me down, it mostly okay day to day but descending stairs and squatting makes it hurt loads, and then if I run it starts hurting almost straight away, just an ache that over the miles builds up to be pretty painful.
Physio said there was nothing wrong with the joint of my knee, she suspects that it's a combination of weak muscles around the knee, and tight quads.
So I have strengthening exercises and stretches that are supposed to help but it's been a month with no improvement.