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Can someone please explain what is the usage of Angle 1 and Angle 2 option in Brush Tool settings? This concept seems quite complex to me and there is this tooltip :
Angle 1 : Angle of the Brush Form
Angle 2 : Additional Angle for the brush form.
Please explain this in more details or give some resources where I can read this.

Both angle sliders give effect. For example, you can set "stroke direction: controller to Angle1 and set Angle2 to 90. The result will be: 90 degrees rotated "brush form" follows the stroke direction

Another example:
The brush shape is a little tree or flower
Angle1=340
Angle2=40 + full random controller enabled
Result = randomly rotated trees on left or right on maximum 60 degree angle why 340 and 40? So 360-340=20 - this is a base angle, and we add random 40 to got random numbers from 340 to 380. So 380 is the same as 20 degrees:) By other words we have random from -20 to 20 degree.