Usually, every game has its standard house edge that can be calculated through complicated mathematics however each casino is deviating from these formula given figures in a small amount. This way, if a player is informed properly about the possibilities a casinos is offering in terms of house edge, they can select the best house edge casinos and play in a safer environment.
Every game has its own house edge. High house edges are considered the ones above 5%, like double 0 roulette with a house edge of 5.22% .
Low house edges are around 0.5%, however casinos might not want to promote playing those games with such low income possibilities through online casino bonuses.

A player should try to find the best house edge casino, even if they are real gamblers who live for the thrill and excitement of feeling the losses or winnings.
It isn’t even hard to find the best casino considering only this aspect of them.
The definition of a house edge can be helpful for any player in determining how much it can cost him to play a certain game over a longer period of time.
Considering that the house edge is not the amount of money lost compared to the amount of money wagered gives the false impression that games with high house edges are not a good gamble, while this should not be the case.
Players feel the effective amount they have wagered and the losses they have had instead of the large statistics of every game. On a micro level (1 player) the amount of money lost/amount of money wagered should give the percentage of  best practice to find the game that can get the best winnings.