Take the deeper one. Slightly too deep reads as a tan and a lighter powder pulls it back. Slightly too light reads grey and there is no fixing it once it is on.

Swatch on your jaw rather than your hand, since hands run darker. Do it in daylight near a window. Then wait twenty minutes, because the shade you see immediately is not the one you will wear.

Coverage and control. A skin tint is sheer and fast. A cushion is medium and buildable with a sponge built in. A stick gives you the most control for spot work and the least for a full face.

It is usually too light, too cool, or going on without a corrector underneath. Match it to your own depth rather than going lighter, and put an orange or red corrector down first.

Only if you have a specific problem to solve. Grip for oily skin, smoothing for texture, hydration for dryness. A primer bought without a reason is just another layer.

Less product, applied in thinner layers, and set only where you actually crease. Most creasing is too much product rather than the wrong product.