The game of roulette is generally played with an elongated table. At one of the ends of the table is a roulette wheel, with a notch in the table where the dealer stands. The surface of the table is covered with a felt layout with boxes for the numbers 1 through 36 arranged in three columns of twelve. At the end of the section of the layout closest to the dealer, above the numbers 1, 2, and 3, are boxes for 0 and 00. Each of the numbers 1 through 36 is surrounded by either a red or black oval or rectangle. The 0 and 00 have green backgrounds. This rectangular grid, with a box for each number, is used for what you call “inside bets.”
Other than the numbered boxes are some other boxes for “outside bets,” encompassing up to 18 numbers at a time. Most of the areas for outside bets are on the long side of the table across from the dealer. Also, at the other side of the rectangle away from the dealer are boxes for bets on each 12-number column.
The roulette wheel has 38 numbered slots, each with the same colored background as the corresponding number on the table layout. The roulette ball used to be made using ivory; nowadays it’s usually plastic. The dealer spins the wheel in one direction, and throws the ball in the other direction around a track on the bowl-shaped recess that holds the wheel. When the speed of the ball decreases, it falls off the track toward the wheel itself, and bounces around until it falls in a numbered slot.
Roulette is entirely a game of chance, and no style of betting, money management, or careful observation can let you win every time. Many have tried it, and many have failed. You must remember that the roulette wheel is completely random.