Your knees hurt because your body position is crossed up. Your whole body should be parallel to the bike. The moment your chest is over the tank but your butt & knees are out places a lot of pressure on your knees.
There are plenty of good BP positions out there but most of them are really too extreme IMO. Also, keep in mind hanging off too much is not a good thing. It can slow you down in the turns. But for beginners try to exaggerate at first then tune it down once you get the feel for it.
Another tip, and this is personally what I've been taught and has worked for me, is to make sure 70% of the weight/pressure is on the outside leg. In other words, if I'm cornering left, most of my weight/pressure is on my right knee/leg. My left leg is loose & relaxed. As you advance you can apply more pressure in the inside foot to help you corner/turn the bike harder.
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