This guy makes our lives easier; he explains the odds of the roulette game. If you think that the inside and outside bets are random as the game, you are far from the truth.
If you throw your chips on the table and they land somewhere on the layout, it does not mean that you will definitely win. If you are not following any strategy or system, you still need to know the odds of the me.
So, the bets. There is a golden rule in betting - the higher possibility that your bet will win, the less money you will win. For example, if you bet on black, there are 50% that this color will be hit but the payout is 1 to 1.
If you are betting on a number by making a straight-up bet, there is a 37 to 1 possibility to hit this number in European roulette, or 38 to 1 - in American roulette but the payout is 35 to 1.
It is up you what bets to make and how to play. It is better to play by knowing what you do.