Principle of commitment & consistency -- When people commit to something, they're far more likely to purchase from you. That's why getting them to agree to something like a free + shipping offer or by agreeing with something you've said in some way. This is a powerful principle in sales and if you pay attention to some of the best marketers in the world, you'll notice that they work fervently to get your commitment to something, even if it's very small in the beginning.
Hi Andrey, it is definitely not for beginners who have no idea how to even make money online at all. If you have a business already, funnel hacks is definitely something that you should invest in. I would say that there are definitely better and more affordable options for beginners too. Paid traffic is a tricky thing, but Funnel Hacks actually break it down easily on how to do it quickly.