You can use either side! Use the stickier, shinier side if you're baking something that you're worried might be hard to peel from the paper.

Yes! Parchment paper isn’t just good for baking. You can also use it to line a pan for roasting meat or vegetables.

With parchment paper, the main concern is temperature rather than length of time. Parchment paper is generally rated safe to around 450° F (232° C)...