do we realy win ?
i lost 0.2 in it
what is the best strategy to win and how do we understand dice system
cant find any tutorial
With your questions looks like you're new to a dice game. There is no way you can win or make money from dice game in the longer run. If you came to dice game to make a money then better stop now before you lose a lot of money in it. Whatever tutorial you will see in youtube will not work in the long run because this game result depends on luck. At current conversion rate, 0.2 BTC is a big money and don't ever try to recover that money again from dice game instead you can try with some other investment. Gamble only if you want a fun, not a money.
He lose because he did not understand fully what he is doing, no strategy or tutorial at all since it's a game of chance and since there is a house edge it is expected that our chances is lower compared to the house. Hence, the best thing to do is to be smart and enjoy the fun it brings, think of the win because it's important but only bet what you can afford to lose.