In simple terms, gambling will always be associated with luck. It’s an inseparable as it may seem. It’s a valid reason that you win because you are lucky, and you lose because you aren’t lucky, that’s how simple it is. However, with sports betting, this kind of game adds skill aside from luck. But still in general, you can’t win and beat the house if you don’t have the luck and skills to make you win. Luck still makes the biggest factor to make you win from gambling.
Yeah, that's true.
In the case of sports betting, you do have to have some kind of internal information that is not publicly available. This is because all the odds are calculated based on public information.
That is, a strong team will pay less than a weak team, and so on.
If you know something that the casino doesn't know, then that's something that you can use to make some money. But that's not really something that you can do in the long term, maybe a one off only.