Fuel: The Trangia burner runs on Tenol or methylated spirits, which are cheap, safe and easily available. Tenol is cleaner, while methylated spirits has a somewhat higher output. About 10-15% water can be added to methylated spirits to reduce blackening of the pans. The burner is most efficient when filled 2/3 capacity.
In extreme cold: a winter attachment can be useful. A pre-warmer is placed under the burner. The stove can stand on it sinking into the snow. The pre-warmer is filled with fuel and is lit to warm the burner.
A simmering ring... is used to regulate the heat, save fuel and will extinguish the flame.