Pinescript indicator just understand the coding

Video source is here:

How are the 3 channels generated?
In the description is something bb 0.5, 2 and 3.5 but this can t be...
Would be great!

It is pretty simple, to be honest I am surprised someone claiming to be a "Vucking good EA Coder..." needs help to figure it out.

The faint silver line is a moving average of the price source specified (default Open prices) of the length specified (default 20), this MA is then used as the basis for everything else along with the Standard Deviation of the prices over the same period.

The outer lines are simply three sets of Bollinger Bands calcuated with different inputs.
The first uses the multiplier specified (default 2.0) and the standard deviation calculated previously
The second uses the multiplier specified plus the increment specified (0.5) and the standard deviation calculated previously
The third uses the multiplier specified plus two times the increment specified and the standard deviation calculated previously

The outer bands are used to detect breakouts of the specified high and low sources (default high prices and low prices)

The rest of the code uses standard functions to plot the lines, fill the gaps and draw arrows when breakouts are detected.

Means 20,2. 20,2.5 …… 20,3.
and thank you for explaining me… dont have the time for pinescript