skrying, clear your mind and look into a reflective surface in the hopes of seeing images to help you with a problem. the tricky part is you don't look into the reflection, but past the mirrored image.
a skrying mirror is called a black mirror, a simple way of making it is colouring the back of a mirror with a black marker. these are magical tools so you can't use your bathroom mirror.
myself, i prefer skrying with water, i find it easier, but i don't skry very often, and when i do it's normally games on certain holidays. hope that helped a little.