The tour is instructive, and from the very first m...

The tour is instructive, and from the very first moment it is chilling and tearful.
Anyone who does not take instruction or shelters with instruction on every point makes a mistake!
An unparalleled experience.
The tutorial gives you orientation, and amazing explanations, extensions and references that just reading on the site does not provide.
I recommend ordering, even off-site on the way there, training devices. It's worth every minute !!!