Not much confidence in the fundamentals

so how to learn all this thing…

Here you go, a link to a great thread on the subject:
http://forums.babypips.com/newbie-island/41475-supply-demand-vsa-wyckoff-petefader.html

Epidot, you must be confident in this VSA system already, it was little over week ago that you abandoned your Zig Zag system on demo for this VSA system you had just found.

Thanks for the info on VSA anyway, I have had a look and it does look great.