You cannot guarantee your bets in gambling. You will have a fifty percent chance of winning or losing. Now if we talk about casino games, then no skill will be of any use to you here. I think casino games are completely based on luck. But in sports betting, you will get an advantage by applying skill but you cannot guarantee it. It is seen that in some matches, strong teams lose against weak teams, so no matter how skilled you are, if your luck is not good, you will lose. So we can say that gambling mostly depends on luck.