It is spam. He posted the list twice and it was quoted in full several times.
What is the best chess product you have bought for your studies?

In the course "Calculate till mate"-description Smirnov meantiones a technique:
"How to improve your knowledge of typical combinations 10 times better than just solving tactical exercises from a book or chess database."
Any idea what this technique is ?

I haven't buy the Calculate till mate. I only have bought Self taught Grandmaster.. for beginner and club level i think its great to have this products. Follow his blog, you will see he have many great free lessons.

most important one: chessboard and pieces
Quoted for truth.
Not that books or other stuff are useless, but they are not as useful as regular practice.

The investment you do is only one part of to be better but another part is the implementation. Without it, everything you invest before became useless. This products is created for purposes to help chess players. I don't think is waste of money if you buy.

The single most useful purchase I've ever made was How to Reassess your chess 3rd edition by Jeremy Silman. But chess.com is a good site.. and there's a lot of other good books too.

There is a course called "Finding the best move" by Igor Smirnov? How come i cant find it in his webiste?

I bought shredder to my Android Phone! Best buy ever! Descent engine and you can save games and play it

There is a course called "Finding the best move" by Igor Smirnov? How come i cant find it in his webiste?
You are right. I can't find it either. But what you can get for free (if you are interested) are some free lessons. Go to the home page and click on the top of the right side of the page where it says "Download Your Free Lesson". I received many emails by the site and saved all those lessons in my laptop.

I have practical chess endings in Greek. It is very good.
The NUMBER 1 most important product for any serious chessplayer to buy is ChessBase. Nothing comes close to second place.