here's a tip that my mom taught me:
take your less dominant hand, and take your foundation and rub in a dab on the line of your hand, at the thumb. I'm talking the space where the top of your hand meets the inside of your hand, near the wrist. the reason being, is usually, the color of this skin is really close to the color of your face. (I dunno why, but its usually true for white and fair skin individuals.. not always, but usually)
if it blends in, then you can use it... if it doesn't match, sometimes its either a shade lighter or darker...
mom told me that its better to do this, than to put it on your face. I dunno why. But it works.. its also a good way to blend foundations, if you have more than one color.... always on the hand first, then the face lol
anyways...
YouTube is awesome for makeup tutorials... if you look at my page on there (same as my DGN name) I have subscribed/favorited quite a few. I love watching them, and most are professionals, they give great tips on skin care as well as actual makeup tutorials. and remember: for everyday wear, more is not always better. also, people wear darker shades at night, because they are easier to see.. during the day, or a brightly lit environment calls for lighter shades. I usually do outlandish colors on myself, but if you aren't into that, you want to highlight your features, not paint around them LOL