The key to playing roulette is the spinning wheel. It has 38 numbers, 1 to 36, a single 0 and a double 00. The numbers are not in numerical order, and they alternate from black to red. The zeros are green. The wheel moves to the left while the ball moves to the right.
You bet on the roulette board. You will notice the wheel numbers are the same numbers on the board, however they display in numerical order, in three columns. Betting is simple; you just put your chips on the number you want. Understanding how to bet is key. There are many different ways to place bets. You can bet on one number, the first dozen, the second dozen, or even the third dozen. You can bet any one of the three columns, or the first 18 numbers, or the second 18 numbers.
Now, that you understand betting, you should understand that there are two types of online roulette. There are games powered by a random number generator (RNG). Then there are games with real dealers at wheels and tables. The RNG selects numbers in random sequences via a computer program. The RNG determines who wins based on the rules and there is no room for error, or buying someone. The RNG processes numbers in seconds, so the play is really fast. Faster than you can even read these words, which may cause some players to get into the habit of just as quickly hitting the play button.
The other version of online roulette has a real dealer, which makes the pace a little slower. You get to actually see the ball spinning and bounce from number to number. That is the major difference between the two, one is run by a computer, while in the other, a real dealer places the ball and the wheel and then spins it.