The game of roulette is generally played using an elongated table. At one of the ends of the table is the roulette wheel, with a notch in the table for the dealer to stand at. The surface of the table is covered with a felt layout with boxes numbered from 1 to 36 arranged in 3 columns and 12 rows. At the end of the part of the layout closest to the dealer, above 1, 2, and 3, are boxes for 0 and 00. Each of the numbers from 1 to 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 a couple of 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. However, at the other end of the rectangle away from the dealer are boxes for bets on each of the 3 columns.
The wheel itself has 38 numbered slots, each with the same colored background as the corresponding number that is found on the table layout. The roulette ball used to be made of ivory; nowadays it is most of the time made of plastic. The dealer spins the wheel in one direction, then 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 purely a game of chance, and no way of betting, money management, or careful observation will help you win every single time. Many have tried it, and many have failed. You must not forget that the roulette wheel is completely random.