How To: Build a Fire with a Flint & Steel

The title is pretty self-explanatory. Here's what you'll need:

Flint and Steele
Cotton or some other very small, dry material (i.e. dead cattail fluff)
Tinder (not the app)
Kindling
Large Sticks up to logs

1. Hold flint firmly in you non-dominant hand and place sharp end on edge of cotton. Strike the steel downward against the flint, pressing firmly and quickly. Be sure to aim sparks at cotton. Do this as many times as it necessary for the cotton to light.
2. Once the cotton has lit, guide it to the tinder. Begin creating a sort of "tepee" shape, because fire catches best this way. 
3. Keep building the fire. Gradually add larger and larger pieces. Be sure to not use wood that is too wet, green or rotten. When the fire is really going, moderately wet pieces can be placed near or on the fire to dry out and eventually burn.