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Double Clutch (technique)

Double clutching is a method of shifting gears used primarily for vehicles with unsynchronized manual transmission, such as commercial trucks and specialty vehicles. While double clutching is not necessary in a vehicle that has a synchronized manual transmission, the technique can be advantageous for smoothly downshifting in order to accelerate.

With this method, instead of pushing the clutch in once and shifting directly to another gear, the driver first engages the transmission in neutral before shifting to the next gear. The clutch is pressed and released with each change.

Technique
The double clutching technique involves the following steps:

The accelerator (throttle) is released, the clutch pedal is pressed, and the gearbox is shifted into neutral.
The clutch pedal is then released, the driver matches the engine speed to the gear speed either using the throttle (accelerator) (or when changing to a lower gear) or waiting for the engine speed to decrease (when changing to a higher gear) until they are at a level suitable for shifting into the next gear.
At the moment when the revs between the engine and gear are closely matched, the driver then immediately presses the clutch again to shift into the next gear. The result should be a very smooth gear change.

If you want to see in video here is link for it.
https://www.youtube.com/watch?v=tescWzTlGQ0

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